diff --git a/StructureHelper/Infrastructure/Enums/PrimitiveType.cs b/StructureHelper/Infrastructure/Enums/PrimitiveType.cs
index 7cf1ab0..596226c 100644
--- a/StructureHelper/Infrastructure/Enums/PrimitiveType.cs
+++ b/StructureHelper/Infrastructure/Enums/PrimitiveType.cs
@@ -3,6 +3,7 @@
     public enum PrimitiveType
     {
         Point,
-        Rectangle
+        Rectangle,
+        Circle
     }
 }
\ No newline at end of file
diff --git a/StructureHelper/Infrastructure/UI/DataContexts/CircleViewPrimitive.cs b/StructureHelper/Infrastructure/UI/DataContexts/CircleViewPrimitive.cs
new file mode 100644
index 0000000..f94a001
--- /dev/null
+++ b/StructureHelper/Infrastructure/UI/DataContexts/CircleViewPrimitive.cs
@@ -0,0 +1,56 @@
+using StructureHelper.Infrastructure.UI.Converters.Units;
+using StructureHelperCommon.Infrastructures.Exceptions;
+using StructureHelperCommon.Infrastructures.Strings;
+using StructureHelperLogics.NdmCalculations.Primitives;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelper.Infrastructure.UI.DataContexts
+{
+    public class CircleViewPrimitive : PrimitiveBase, IHasDivision, IHasCenter
+    {
+        ICirclePrimitive primitive;
+        public double Diameter
+        { get
+            {
+                return primitive.Diameter;
+            }
+        set
+            {
+                primitive.Diameter = value;
+                RefreshPlacement();
+            }
+        }
+        public int NdmMinDivision { get; set; }
+        public double NdmMaxSize { get; set; }
+
+        public double PrimitiveLeft => DeltaX - Diameter / 2d;
+        public double PrimitiveTop => DeltaY - Diameter / 2d;
+
+        public CircleViewPrimitive(INdmPrimitive primitive) : base(primitive)
+        {
+            if (primitive is not ICirclePrimitive)
+            {
+                throw new StructureHelperException(ErrorStrings.DataIsInCorrect + $"\nExpected: {nameof(ICirclePrimitive)}, But was: {nameof(primitive)}");
+            }
+            this.primitive = primitive as ICirclePrimitive;
+        }
+
+        public override INdmPrimitive GetNdmPrimitive()
+        {
+            return primitive;
+        }
+
+        private void RefreshPlacement()
+        {
+            OnPropertyChanged(nameof(Diameter));
+            OnPropertyChanged(nameof(CenterX));
+            OnPropertyChanged(nameof(CenterY));
+            OnPropertyChanged(nameof(PrimitiveLeft));
+            OnPropertyChanged(nameof(PrimitiveTop));
+        }
+    }
+}
diff --git a/StructureHelper/Infrastructure/UI/DataContexts/PrimitiveOperations.cs b/StructureHelper/Infrastructure/UI/DataContexts/PrimitiveOperations.cs
index 7e3c315..719c60c 100644
--- a/StructureHelper/Infrastructure/UI/DataContexts/PrimitiveOperations.cs
+++ b/StructureHelper/Infrastructure/UI/DataContexts/PrimitiveOperations.cs
@@ -19,16 +19,21 @@ namespace StructureHelper.Infrastructure.UI.DataContexts
             ObservableCollection<PrimitiveBase> viewItems = new ObservableCollection<PrimitiveBase>();
             foreach (var item in primitives)
             {
-                if (item is IPointPrimitive)
-                {
-                    var point = item as IPointPrimitive;
-                    viewItems.Add(new PointViewPrimitive(point));
-                }
-                else if (item is IRectanglePrimitive)
+                if (item is IRectanglePrimitive)
                 {
                     var rect = item as IRectanglePrimitive;
                     viewItems.Add(new RectangleViewPrimitive(rect));
                 }
+                else if (item is ICirclePrimitive)
+                {
+                    var circle = item as ICirclePrimitive;
+                    viewItems.Add(new CircleViewPrimitive(circle));
+                }
+                else if (item is IPointPrimitive)
+                {
+                    var point = item as IPointPrimitive;
+                    viewItems.Add(new PointViewPrimitive(point));
+                }
                 else throw new StructureHelperException(ErrorStrings.ObjectTypeIsUnknown);
             }
             return viewItems;
diff --git a/StructureHelper/Infrastructure/UI/DataTemplates/EllipseTemplate.xaml b/StructureHelper/Infrastructure/UI/DataTemplates/EllipseTemplate.xaml
index d974201..ce12680 100644
--- a/StructureHelper/Infrastructure/UI/DataTemplates/EllipseTemplate.xaml
+++ b/StructureHelper/Infrastructure/UI/DataTemplates/EllipseTemplate.xaml
@@ -10,7 +10,7 @@
              xmlns:userControls="clr-namespace:StructureHelper.Infrastructure.UI.UserControls"
              mc:Ignorable="d">
     <StackPanel>
-        <Ellipse Style="{StaticResource EllipseStyle}" d:DataContext="{d:DesignInstance dataContexts:PointViewPrimitive}">
+        <Ellipse Style="{StaticResource EllipseStyle}" d:DataContext="{d:DesignInstance dataContexts:PointViewPrimitive}" Tag ="{Binding}">
             <Ellipse.ToolTip>
                 <Grid>
                     <Grid.ColumnDefinitions>
@@ -43,6 +43,5 @@
                 </TransformGroup>
             </Ellipse.RenderTransform>
         </Ellipse>
-        <userControls:PrimitivePopup Type="Rectangle" IsOpen="{Binding ParamsPanelVisibilty}" d:DataContext="{d:DesignInstance dataContexts:PrimitiveBase}"/>
     </StackPanel>
 </UserControl>
diff --git a/StructureHelper/Infrastructure/UI/DataTemplates/RectangleTemplate.xaml b/StructureHelper/Infrastructure/UI/DataTemplates/RectangleTemplate.xaml
index dc410d2..89eb81a 100644
--- a/StructureHelper/Infrastructure/UI/DataTemplates/RectangleTemplate.xaml
+++ b/StructureHelper/Infrastructure/UI/DataTemplates/RectangleTemplate.xaml
@@ -52,6 +52,5 @@
                 </Rectangle.RenderTransform>
             </Rectangle>
         </Grid>
-        <userControls:PrimitivePopup IsOpen="{Binding ParamsPanelVisibilty}"/>
     </StackPanel>
 </UserControl>
diff --git a/StructureHelper/Libraries/LoaderCalculator.dll b/StructureHelper/Libraries/LoaderCalculator.dll
index fc4e080..16ad4e5 100644
Binary files a/StructureHelper/Libraries/LoaderCalculator.dll and b/StructureHelper/Libraries/LoaderCalculator.dll differ
diff --git a/StructureHelper/Windows/MainWindow/MainView.xaml b/StructureHelper/Windows/MainWindow/MainView.xaml
index 53028ca..0234fdb 100644
--- a/StructureHelper/Windows/MainWindow/MainView.xaml
+++ b/StructureHelper/Windows/MainWindow/MainView.xaml
@@ -18,6 +18,9 @@
         <DataTemplate DataType="{x:Type dataContexts:RectangleViewPrimitive}">
             <dataTemplates:RectangleTemplate/>
         </DataTemplate>
+        <DataTemplate DataType="{x:Type dataContexts:CircleViewPrimitive}">
+            <dataTemplates:EllipseTemplate/>
+        </DataTemplate>
         <DataTemplate DataType="{x:Type dataContexts:PointViewPrimitive}">
             <dataTemplates:EllipseTemplate/>
         </DataTemplate>
@@ -97,23 +100,24 @@
                         <ListBox ItemsSource="{Binding HeadMaterials}"  ItemTemplate="{StaticResource ColoredItemTemplate}">
                         </ListBox>
                     </Expander>
-                    <Expander Header="Geometry" MinWidth="20" DataContext="{Binding PrimitiveLogic}">
+                    <Expander Header="Geometry" MinWidth="20">
                         <Expander.ContextMenu>
                             <ContextMenu>
                                 <MenuItem Header="Add">
-                                    <Button Content="Add Rectangle" Command="{Binding Add}" CommandParameter="{x:Static enums:PrimitiveType.Rectangle}"/>
-                                    <Button Content="Add Point" Command="{Binding Add}" CommandParameter="{x:Static enums:PrimitiveType.Point}"/>
+                                    <Button Content="Add Rectangle" Command="{Binding PrimitiveLogic.Add}" CommandParameter="{x:Static enums:PrimitiveType.Rectangle}"/>
+                                    <Button Content="Add Circle" Command="{Binding PrimitiveLogic.Add}" CommandParameter="{x:Static enums:PrimitiveType.Circle}"/>
+                                    <Button Content="Add Point" Command="{Binding PrimitiveLogic.Add}" CommandParameter="{x:Static enums:PrimitiveType.Point}"/>
                                 </MenuItem>
                             </ContextMenu>
                         </Expander.ContextMenu>
                         <ListBox ItemsSource="{Binding Items}" SelectedItem="{Binding SelectedItem}" ItemTemplate="{StaticResource ColoredItemTemplate}">
                             <ListBox.ContextMenu>
                                 <ContextMenu>
-                                    <Button Content="Edit" Command="{Binding Edit}"/>
-                                    <Button Content="Copy" Command="{Binding Copy}"/>
-                                    <Button Content="Delete" Command="{Binding Delete}"/>
-                                    <Button Content="To Foreground" Command="{Binding SetToFront}"/>
-                                    <Button Content="To Background" Command="{Binding SetToBack}"/>
+                                    <Button Content="Edit" Command="{Binding PrimitiveLogic.Edit}"/>
+                                    <Button Content="Copy" Command="{Binding PrimitiveLogic.Copy}"/>
+                                    <Button Content="Delete" Command="{Binding PrimitiveLogic.Delete}"/>
+                                    <Button Content="To Foreground" Command="{Binding PrimitiveLogic.SetToFront}"/>
+                                    <Button Content="To Background" Command="{Binding PrimitiveLogic.SetToBack}"/>
                                 </ContextMenu>
                             </ListBox.ContextMenu>
                         </ListBox>
@@ -152,6 +156,15 @@
                 </i:Interaction.Triggers>
                 <ScrollViewer VerticalScrollBarVisibility="Visible" HorizontalScrollBarVisibility="Visible">
                     <Canvas Name="WorkPlane" ClipToBounds="True" Width="{Binding CanvasWidth}" Height="{Binding CanvasHeight}">
+                        <Canvas.ContextMenu>
+                            <ContextMenu>
+                                <MenuItem Header="Add">
+                                    <Button Content="Add Rectangle" Command="{Binding PrimitiveLogic.Add}" CommandParameter="{x:Static enums:PrimitiveType.Rectangle}"/>
+                                    <Button Content="Add Circle" Command="{Binding PrimitiveLogic.Add}" CommandParameter="{x:Static enums:PrimitiveType.Circle}"/>
+                                    <Button Content="Add Point" Command="{Binding PrimitiveLogic.Add}" CommandParameter="{x:Static enums:PrimitiveType.Point}"/>
+                                </MenuItem>
+                            </ContextMenu>
+                        </Canvas.ContextMenu>
                         <i:Interaction.Behaviors>
                             <infrastructure:MouseBehaviour MouseX="{Binding PanelX, Mode=OneWayToSource}" MouseY="{Binding PanelY, Mode=OneWayToSource}"/>
                         </i:Interaction.Behaviors>
@@ -182,9 +195,9 @@
                         <Line X1="{Binding YX1}" X2="{Binding YX1}" Y1="0" Y2="{Binding YY2}" Stroke="ForestGreen" StrokeThickness="{Binding AxisLineThickness}"/>
                         <ItemsControl ItemsSource="{Binding PrimitiveLogic.Items}" d:DataContext="{d:DesignInstance vm:MainViewModel}">
                             <ItemsControl.ItemsPanel>
-                                <ItemsPanelTemplate>
-                                    <Canvas/>
-                                </ItemsPanelTemplate>
+                                    <ItemsPanelTemplate>
+                                        <Canvas/>
+                                    </ItemsPanelTemplate>
                             </ItemsControl.ItemsPanel>
                             <ItemsControl.ItemContainerStyle>
                                 <Style TargetType="ContentPresenter">
@@ -192,8 +205,18 @@
                                     <Setter Property="Canvas.Left" Value="{Binding PrimitiveLeft}"/>
                                     <Setter Property="Canvas.Top" Value="{Binding PrimitiveTop}"/>
                                     <Setter Property="Visibility" Value="{Binding IsVisible, Converter={StaticResource BooleanToVisibilityConverter}}"/>
+                                    <EventSetter Event="MouseDown" Handler="ContentPresenter_MouseLeftButtonDown"/>
                                 </Style>
                             </ItemsControl.ItemContainerStyle>
+                            <ItemsControl.ContextMenu>
+                                <ContextMenu>
+                                    <Button Content="Edit primitive" Command="{Binding PrimitiveLogic.Edit}"/>
+                                    <Button Content="Copy" Command="{Binding PrimitiveLogic.Copy}"/>
+                                    <Button Content="Delete" Command="{Binding PrimitiveLogic.Delete}"/>
+                                    <Button Content="To Foreground" Command="{Binding PrimitiveLogic.SetToFront}"/>
+                                    <Button Content="To Background" Command="{Binding PrimitiveLogic.SetToBack}"/>
+                                </ContextMenu>
+                            </ItemsControl.ContextMenu>
                         </ItemsControl>
                     </Canvas>
                 </ScrollViewer>
diff --git a/StructureHelper/Windows/MainWindow/MainView.xaml.cs b/StructureHelper/Windows/MainWindow/MainView.xaml.cs
index 54fb619..5c4d817 100644
--- a/StructureHelper/Windows/MainWindow/MainView.xaml.cs
+++ b/StructureHelper/Windows/MainWindow/MainView.xaml.cs
@@ -1,4 +1,6 @@
 using System.Windows;
+using System.Windows.Controls;
+using StructureHelper.Infrastructure.UI.DataContexts;
 using StructureHelper.Services;
 using StructureHelper.Services.Primitives;
 
@@ -6,13 +8,22 @@ namespace StructureHelper.Windows.MainWindow
 {
     public partial class MainView : Window
     {
+        private MainViewModel viewModel;
         public IPrimitiveRepository PrimitiveRepository { get; }
 
         public MainView(IPrimitiveRepository primitiveRepository, MainViewModel viewModel)
         {
             PrimitiveRepository = primitiveRepository;
-            DataContext = viewModel;
+            this.viewModel = viewModel;
+            DataContext = this.viewModel;
             InitializeComponent();
         }
+
+        private void ContentPresenter_MouseLeftButtonDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
+        {
+            var contentPresenter = sender as ContentPresenter;
+            var item = contentPresenter?.Content as PrimitiveBase;
+            viewModel.PrimitiveLogic.SelectedItem = item;
+        }
     }
 }
diff --git a/StructureHelper/Windows/MainWindow/MainViewModel.cs b/StructureHelper/Windows/MainWindow/MainViewModel.cs
index e7df72c..c11bf65 100644
--- a/StructureHelper/Windows/MainWindow/MainViewModel.cs
+++ b/StructureHelper/Windows/MainWindow/MainViewModel.cs
@@ -191,10 +191,26 @@ namespace StructureHelper.Windows.MainWindow
             }
         }
 
+        public RelayCommand SelectPrimitiveCommand
+        {
+            get
+            {
+                return selectPrimitive ??
+                    (selectPrimitive = new RelayCommand(obj=>
+                    {
+                        if (obj is PrimitiveBase)
+                        {
+                            SelectedPrimitive = obj as PrimitiveBase;
+                        }
+                    }));
+            }
+        }
+
         private double delta = 0.0005;
         private ActionsViewModel combinationsLogic;
         private IPrimitiveViewModelLogic primitiveLogic;
         private RelayCommand showVisualProperty;
+        private RelayCommand selectPrimitive;
 
         public MainViewModel(MainModel model)
         {
@@ -208,7 +224,7 @@ namespace StructureHelper.Windows.MainWindow
             XY1 = CanvasHeight / 2d;
             YX1 = CanvasWidth / 2d;
             YY2 = CanvasHeight;
-            scaleValue = 400d;
+            scaleValue = 300d;
 
             LeftButtonUp = new RelayCommand(o =>
             {
diff --git a/StructureHelper/Windows/PrimitivePropertiesWindow/PrimitivePropertiesView.xaml b/StructureHelper/Windows/PrimitivePropertiesWindow/PrimitivePropertiesView.xaml
index 173a83f..34eb61f 100644
--- a/StructureHelper/Windows/PrimitivePropertiesWindow/PrimitivePropertiesView.xaml
+++ b/StructureHelper/Windows/PrimitivePropertiesWindow/PrimitivePropertiesView.xaml
@@ -28,6 +28,21 @@
                 </Grid>
             </Expander>
         </DataTemplate>
+        <DataTemplate x:Key="CircleProperties">
+            <Expander Header="Circle" IsExpanded="True">
+                <Grid>
+                    <Grid.RowDefinitions>
+                        <RowDefinition Height="22"/>
+                    </Grid.RowDefinitions>
+                    <Grid.ColumnDefinitions>
+                        <ColumnDefinition Width="100"/>
+                        <ColumnDefinition/>
+                    </Grid.ColumnDefinitions>
+                    <TextBlock Grid.Row="0" Text="Diameter"/>
+                    <TextBox Grid.Row="0" Grid.Column="1" Margin="1" Text="{Binding Diameter, Converter={StaticResource LengthConverter}, ValidatesOnExceptions=True}"/>
+                </Grid>
+            </Expander>
+        </DataTemplate>
         <DataTemplate x:Key="PointProperties">
             <Expander Header="Point" IsExpanded="True">
                 <Grid>
diff --git a/StructureHelper/Windows/PrimitivePropertiesWindow/PrimitivePropertiesView.xaml.cs b/StructureHelper/Windows/PrimitivePropertiesWindow/PrimitivePropertiesView.xaml.cs
index cff5505..f28700a 100644
--- a/StructureHelper/Windows/PrimitivePropertiesWindow/PrimitivePropertiesView.xaml.cs
+++ b/StructureHelper/Windows/PrimitivePropertiesWindow/PrimitivePropertiesView.xaml.cs
@@ -36,6 +36,7 @@ namespace StructureHelper.Windows.PrimitiveProperiesWindow
             this.DataContext = viewModel;
             InitializeComponent();
             if (primitive is RectangleViewPrimitive) { AddPrimitiveProperties(PrimitiveType.Rectangle); }
+            else if (primitive is CircleViewPrimitive) { AddPrimitiveProperties(PrimitiveType.Circle); }
             else if (primitive is PointViewPrimitive) { AddPrimitiveProperties(PrimitiveType.Point); }
             else { throw new Exception("Type of object is unknown"); }   
         }
@@ -44,6 +45,7 @@ namespace StructureHelper.Windows.PrimitiveProperiesWindow
             List<string> names = new List<string>();
             if (primitive is IHasDivision) { names.Add("TriangulationProperties");}
             if (primitive is RectangleViewPrimitive) { names.Add("RectangleProperties"); }
+            else if (primitive is CircleViewPrimitive) { names.Add("CircleProperties"); }
             else if (primitive is PointViewPrimitive) { names.Add("PointProperties"); }
             foreach (var name in names)
             {
diff --git a/StructureHelper/Windows/ViewModels/NdmCrossSections/CrossSectionViewVisualProperty.cs b/StructureHelper/Windows/ViewModels/NdmCrossSections/CrossSectionViewVisualProperty.cs
index c9e5e4c..e41f9a4 100644
--- a/StructureHelper/Windows/ViewModels/NdmCrossSections/CrossSectionViewVisualProperty.cs
+++ b/StructureHelper/Windows/ViewModels/NdmCrossSections/CrossSectionViewVisualProperty.cs
@@ -19,8 +19,8 @@ namespace StructureHelper.Windows.ViewModels.NdmCrossSections
             AxisLineThickness = 2d;
             GridLineThickness = 0.25d;
             GridSize = 0.05d;
-            WorkPlainWidth = 2d;
-            WorkPlainHeight = 1.6d;
+            WorkPlainWidth = 2.4d;
+            WorkPlainHeight = 2.0d;
         }
     }
 }
diff --git a/StructureHelper/Windows/ViewModels/NdmCrossSections/PrimitiveViewModelLogic.cs b/StructureHelper/Windows/ViewModels/NdmCrossSections/PrimitiveViewModelLogic.cs
index e8df0e8..c674ee4 100644
--- a/StructureHelper/Windows/ViewModels/NdmCrossSections/PrimitiveViewModelLogic.cs
+++ b/StructureHelper/Windows/ViewModels/NdmCrossSections/PrimitiveViewModelLogic.cs
@@ -78,7 +78,15 @@ namespace StructureHelper.Windows.ViewModels.NdmCrossSections
                 ndmPrimitive = primitive;
                 viewPrimitive = new PointViewPrimitive(primitive);
             }
-
+            else if (primitiveType == PrimitiveType.Circle)
+            {
+                var primitive = new CirclePrimitive
+                {
+                    Diameter = 0.5d
+                };
+                ndmPrimitive = primitive;
+                viewPrimitive = new CircleViewPrimitive(primitive);
+            }
             else { throw new StructureHelperException(ErrorStrings.ObjectTypeIsUnknown + nameof(primitiveType)); }
             viewPrimitive.RegisterDeltas(CanvasWidth / 2, CanvasHeight / 2);
             repository.Primitives.Add(ndmPrimitive);
@@ -159,6 +167,7 @@ namespace StructureHelper.Windows.ViewModels.NdmCrossSections
             repository.Primitives.Add(newPrimitive);
             PrimitiveBase primitiveBase;
             if (newPrimitive is IRectanglePrimitive) { primitiveBase = new RectangleViewPrimitive(newPrimitive as IRectanglePrimitive); }
+            else if (newPrimitive is ICirclePrimitive) { primitiveBase = new CircleViewPrimitive(newPrimitive as ICirclePrimitive); }
             else if (newPrimitive is IPointPrimitive) { primitiveBase = new PointViewPrimitive(newPrimitive as IPointPrimitive); }
             else throw new StructureHelperException(ErrorStrings.ObjectTypeIsUnknown);
             primitiveBase.RegisterDeltas(CanvasWidth / 2, CanvasHeight / 2);
diff --git a/StructureHelper/Windows/ViewModels/PrimitiveTemplates/RCs/RectangleBeamViewModel.cs b/StructureHelper/Windows/ViewModels/PrimitiveTemplates/RCs/RectangleBeamViewModel.cs
index 099e09d..2157442 100644
--- a/StructureHelper/Windows/ViewModels/PrimitiveTemplates/RCs/RectangleBeamViewModel.cs
+++ b/StructureHelper/Windows/ViewModels/PrimitiveTemplates/RCs/RectangleBeamViewModel.cs
@@ -17,7 +17,7 @@ namespace StructureHelper.Windows.ViewModels.PrimitiveTemplates.RCs
     {
 		public IRectangleBeamTemplate Model;
 
-		private RectangleShape rectangle => (Model.Shape as RectangleShape);
+		private RectangleShape rectangle => Model.Shape as RectangleShape;
 
 		public Window ParentWindow { get; set; }
 
diff --git a/StructureHelperCommon/Infrastructures/Strings/ErrorString.cs b/StructureHelperCommon/Infrastructures/Strings/ErrorString.cs
index 1939600..7ccbc75 100644
--- a/StructureHelperCommon/Infrastructures/Strings/ErrorString.cs
+++ b/StructureHelperCommon/Infrastructures/Strings/ErrorString.cs
@@ -9,7 +9,7 @@
         public static string ShapeIsNotCorrect => "#0004: Shape is not valid";
         public static string LimitStatesIsNotValid => "#0005: Type of limite state is not valid";
         public static string LoadTermIsNotValid => "#0006: Load term is not valid";
-        public static string IncorrectValue => "#0007: value is not valid";
+        public static string IncorrectValue => "#0007: Value is not valid";
         public static string FileCantBeDeleted => "#0008: File can't be deleted";
         public static string FileCantBeSaved => "#0009: File can't be saved";
         public static string VisualPropertyIsNotRight => "#0010: VisualPropertyIsNotRight";
diff --git a/StructureHelperCommon/Models/Shapes/ICircle.cs b/StructureHelperCommon/Models/Shapes/ICircleShape.cs
similarity index 70%
rename from StructureHelperCommon/Models/Shapes/ICircle.cs
rename to StructureHelperCommon/Models/Shapes/ICircleShape.cs
index 93b181f..068031e 100644
--- a/StructureHelperCommon/Models/Shapes/ICircle.cs
+++ b/StructureHelperCommon/Models/Shapes/ICircleShape.cs
@@ -1,6 +1,6 @@
 namespace StructureHelperCommon.Models.Shapes
 {
-    public interface ICircle : IShape
+    public interface ICircleShape : IShape
     {
         double Diameter { get; set; }
     }
diff --git a/StructureHelperCommon/Services/ShapeServices/ShapeService.cs b/StructureHelperCommon/Services/ShapeServices/ShapeService.cs
index e198a12..ba5d8dc 100644
--- a/StructureHelperCommon/Services/ShapeServices/ShapeService.cs
+++ b/StructureHelperCommon/Services/ShapeServices/ShapeService.cs
@@ -18,5 +18,10 @@ namespace StructureHelperCommon.Services.ShapeServices
             target.Height = source.Height;
             target.Angle = source.Angle;
         }
+
+        public static void CopyCircleProperties(ICircleShape source, ICircleShape target)
+        {
+            target.Diameter = source.Diameter;
+        }
     }
 }
diff --git a/StructureHelperLogics/Models/Templates/CrossSections/RCs/CircleGeometryLogic.cs b/StructureHelperLogics/Models/Templates/CrossSections/RCs/CircleGeometryLogic.cs
new file mode 100644
index 0000000..6cdfb08
--- /dev/null
+++ b/StructureHelperLogics/Models/Templates/CrossSections/RCs/CircleGeometryLogic.cs
@@ -0,0 +1,61 @@
+using StructureHelper.Models.Materials;
+using StructureHelperLogics.Models.Primitives;
+using StructureHelperLogics.NdmCalculations.Primitives;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Media.Media3D;
+
+namespace StructureHelperLogics.Models.Templates.CrossSections.RCs
+{
+    public class CircleGeometryLogic : IRCGeometryLogic
+    {
+        ICircleBeamTemplate template;
+        
+        
+        public IEnumerable<IHeadMaterial> HeadMaterials { get; set; }
+
+        public CircleGeometryLogic(ICircleBeamTemplate template)
+        {
+            this.template = template;
+        }
+
+        public IEnumerable<INdmPrimitive> GetNdmPrimitives()
+        {
+            List<INdmPrimitive> primitives = new List<INdmPrimitive>();
+            primitives.AddRange(GetConcretePrimitives());
+            primitives.AddRange(GetReinfrocementPrimitives());
+            return primitives;
+        }
+
+        private IEnumerable<INdmPrimitive> GetConcretePrimitives()
+        {
+            var diameter = template.SectionDiameter;
+            var concreteMaterial = HeadMaterials.ToList()[0];
+            var primitives = new List<INdmPrimitive>();
+            var rectangle = new CirclePrimitive() { Diameter = diameter, Name = "Concrete block", HeadMaterial = concreteMaterial };
+            primitives.Add(rectangle);
+            return primitives;
+        }
+
+        private IEnumerable<INdmPrimitive> GetReinfrocementPrimitives()
+        {
+            var reinforcementMaterial = HeadMaterials.ToList()[1];
+            var radius = template.SectionDiameter / 2 - template.CoverGap;
+            var dAngle = 2d * Math.PI / template.BarQuantity;
+            var barArea = Math.PI* template.BarDiameter* template.BarDiameter / 4d;
+            var primitives = new List<INdmPrimitive>();
+            for (int i = 0; i < template.BarQuantity; i++)
+            {
+                var angle = i * dAngle;
+                var x = radius * Math.Sin(angle);
+                var y = radius * Math.Cos(angle);
+                var point = new PointPrimitive() { CenterX = x, CenterY = y, Area = barArea, Name = "Left bottom point", HeadMaterial = reinforcementMaterial };
+                primitives.Add(point);
+            }
+            return primitives;
+        }
+    }
+}
diff --git a/StructureHelperLogics/Models/Templates/CrossSections/RCs/ICircleBeamTemplate.cs b/StructureHelperLogics/Models/Templates/CrossSections/RCs/ICircleBeamTemplate.cs
new file mode 100644
index 0000000..179407e
--- /dev/null
+++ b/StructureHelperLogics/Models/Templates/CrossSections/RCs/ICircleBeamTemplate.cs
@@ -0,0 +1,20 @@
+using StructureHelperCommon.Models.Shapes;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperLogics.Models.Templates.CrossSections.RCs
+{
+    public interface ICircleBeamTemplate
+    {
+        ICircleShape Circle { get; }
+        double CoverGap { get; set; }
+        double SectionDiameter { get; set; }
+        int BarQuantity { get; set; }
+        double BarDiameter { get; set; }
+
+
+    }
+}
diff --git a/StructureHelperLogics/Models/Templates/CrossSections/RCs/RectGeometryLogic.cs b/StructureHelperLogics/Models/Templates/CrossSections/RCs/RectGeometryLogic.cs
index 2910820..cc14ce3 100644
--- a/StructureHelperLogics/Models/Templates/CrossSections/RCs/RectGeometryLogic.cs
+++ b/StructureHelperLogics/Models/Templates/CrossSections/RCs/RectGeometryLogic.cs
@@ -46,7 +46,7 @@ namespace StructureHelperLogics.Models.Templates.CrossSections.RCs
 
         private IEnumerable<INdmPrimitive> GetConcretePrimitives()
         {
-            List<INdmPrimitive> primitives = new List<INdmPrimitive>();
+            var primitives = new List<INdmPrimitive>();
             var rectangle = new RectanglePrimitive(concrete) { Width = width, Height = height, Name = "Concrete block" };
             primitives.Add(rectangle);
             return primitives;
diff --git a/StructureHelperLogics/NdmCalculations/Primitives/CirclePrimitive.cs b/StructureHelperLogics/NdmCalculations/Primitives/CirclePrimitive.cs
new file mode 100644
index 0000000..588c69f
--- /dev/null
+++ b/StructureHelperLogics/NdmCalculations/Primitives/CirclePrimitive.cs
@@ -0,0 +1,66 @@
+using LoaderCalculator.Data.Materials;
+using LoaderCalculator.Data.Ndms;
+using StructureHelper.Models.Materials;
+using StructureHelperCommon.Models.Forces;
+using StructureHelperCommon.Services.ShapeServices;
+using StructureHelperLogics.NdmCalculations.Triangulations;
+using StructureHelperLogics.Services.NdmPrimitives;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperLogics.NdmCalculations.Primitives
+{
+    public class CirclePrimitive : ICirclePrimitive
+    {
+        public int Id { get; set; }
+        public string Name { get; set; }
+        public double CenterX { get; set; }
+        public double CenterY { get; set; }
+        public IHeadMaterial? HeadMaterial { get; set; }
+
+        public IStrainTuple UsersPrestrain { get; }
+
+        public IStrainTuple AutoPrestrain { get; }
+
+        public IVisualProperty VisualProperty { get; }
+
+        public double Diameter { get; set; }
+        public double NdmMaxSize { get; set; }
+        public int NdmMinDivision { get; set; }
+
+        public CirclePrimitive()
+        {
+            Name = "New Circle";
+            NdmMaxSize = 0.01d;
+            NdmMinDivision = 10;
+            VisualProperty = new VisualProperty { Opacity = 0.8d };
+            UsersPrestrain = new StrainTuple();
+            AutoPrestrain = new StrainTuple();
+        }
+
+        public object Clone()
+        {
+            var primitive = new CirclePrimitive();
+            NdmPrimitivesService.CopyDivisionProperties(this, primitive);
+            ShapeService.CopyCircleProperties(this, primitive);
+            return primitive;
+        }
+
+        public IEnumerable<INdm> GetNdms(IMaterial material)
+        {
+            var ndms = new List<INdm>();
+            var options = new CircleTriangulationLogicOptions(this);
+            var logic = new CircleTriangulationLogic(options);
+            ndms.AddRange(logic.GetNdmCollection(material));
+            return ndms;
+        }
+
+        public void Save()
+        {
+            throw new NotImplementedException();
+        }
+    }
+}
diff --git a/StructureHelperLogics/NdmCalculations/Primitives/ICirclePrimitive.cs b/StructureHelperLogics/NdmCalculations/Primitives/ICirclePrimitive.cs
new file mode 100644
index 0000000..74f9438
--- /dev/null
+++ b/StructureHelperLogics/NdmCalculations/Primitives/ICirclePrimitive.cs
@@ -0,0 +1,13 @@
+using StructureHelperCommon.Models.Shapes;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperLogics.NdmCalculations.Primitives
+{
+    public interface ICirclePrimitive : IHasDivisionSize, ICircleShape
+    {
+    }
+}
diff --git a/StructureHelperLogics/NdmCalculations/Primitives/INdmPrimitive.cs b/StructureHelperLogics/NdmCalculations/Primitives/INdmPrimitive.cs
index b5584c9..4eb6cd1 100644
--- a/StructureHelperLogics/NdmCalculations/Primitives/INdmPrimitive.cs
+++ b/StructureHelperLogics/NdmCalculations/Primitives/INdmPrimitive.cs
@@ -16,7 +16,7 @@ namespace StructureHelperLogics.NdmCalculations.Primitives
         string Name { get; set; }
         double CenterX { get; set; }
         double CenterY { get; set; }
-        IHeadMaterial HeadMaterial { get; set; }
+        IHeadMaterial? HeadMaterial { get; set; }
         IStrainTuple UsersPrestrain { get; }
         IStrainTuple AutoPrestrain { get; }
         //double PrestrainKx { get; set; }
diff --git a/StructureHelperLogics/NdmCalculations/Primitives/RectanglePrimitive.cs b/StructureHelperLogics/NdmCalculations/Primitives/RectanglePrimitive.cs
index a7d4cca..836468d 100644
--- a/StructureHelperLogics/NdmCalculations/Primitives/RectanglePrimitive.cs
+++ b/StructureHelperLogics/NdmCalculations/Primitives/RectanglePrimitive.cs
@@ -22,7 +22,7 @@ namespace StructureHelperLogics.NdmCalculations.Primitives
         public string Name { get; set; }
         public double CenterX { get; set; }
         public double CenterY { get; set; }
-        public IHeadMaterial HeadMaterial { get; set; }
+        public IHeadMaterial? HeadMaterial { get; set; }
         public IStrainTuple UsersPrestrain { get; private set; }
         public IStrainTuple AutoPrestrain { get; private set; }
         public double NdmMaxSize { get; set; }
@@ -47,7 +47,7 @@ namespace StructureHelperLogics.NdmCalculations.Primitives
 
         public object Clone()
         {
-            RectanglePrimitive primitive = new RectanglePrimitive();
+            var primitive = new RectanglePrimitive();
             NdmPrimitivesService.CopyDivisionProperties(this, primitive);
             ShapeService.CopyRectangleProperties(this, primitive);
             return primitive;
@@ -55,9 +55,9 @@ namespace StructureHelperLogics.NdmCalculations.Primitives
 
         public IEnumerable<INdm> GetNdms(IMaterial material)
         {
-            List<INdm> ndms = new List<INdm>();
+            var ndms = new List<INdm>();
             var options = new RectangleTriangulationLogicOptions(this);
-            ITriangulationLogic logic = new RectangleTriangulationLogic(options);
+            var logic = new RectangleTriangulationLogic(options);
             ndms.AddRange(logic.GetNdmCollection(material));
             return ndms;
         }
diff --git a/StructureHelperLogics/NdmCalculations/Triangulations/CircleTriangulationLogic.cs b/StructureHelperLogics/NdmCalculations/Triangulations/CircleTriangulationLogic.cs
new file mode 100644
index 0000000..344f3f4
--- /dev/null
+++ b/StructureHelperLogics/NdmCalculations/Triangulations/CircleTriangulationLogic.cs
@@ -0,0 +1,47 @@
+using LoaderCalculator.Data.Materials;
+using LoaderCalculator.Data.Ndms;
+using StructureHelperCommon.Infrastructures.Exceptions;
+using StructureHelperCommon.Infrastructures.Strings;
+using StructureHelperLogics.NdmCalculations.Primitives;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperLogics.NdmCalculations.Triangulations
+{
+    internal class CircleTriangulationLogic : ITriangulationLogic
+    {
+        CircleTriangulationLogicOptions options;
+        public ITriangulationLogicOptions Options { get; private set; }
+        public CircleTriangulationLogic(ITriangulationLogicOptions options)
+        {
+            ValidateOptions(options);
+            this.options = options as CircleTriangulationLogicOptions;
+            Options = options;
+        }
+
+        public IEnumerable<INdm> GetNdmCollection(IMaterial material)
+        {
+
+            double diameter = options.Circle.Diameter;
+            double ndmMaxSize = options.NdmMaxSize;
+            int ndmMinDivision = options.NdmMinDivision;
+            var logicOptions = new LoaderCalculator.Triangulations.CircleTriangulationLogicOptions(diameter, ndmMaxSize, ndmMinDivision);
+            var logic = LoaderCalculator.Triangulations.Triangulation.GetLogicInstance(logicOptions);
+            var ndmCollection = logic.GetNdmCollection(new LoaderCalculator.Data.Planes.CirclePlane { Material = material });
+            TriangulationService.CommonTransform(ndmCollection, options);
+            TriangulationService.SetPrestrain(ndmCollection, options.Prestrain);
+            return ndmCollection;
+        }
+
+        public void ValidateOptions(ITriangulationLogicOptions options)
+        {
+            if (options is not ICircleTriangulationLogicOptions )
+            {
+                throw new StructureHelperException(ErrorStrings.DataIsInCorrect + $"\n Expected: {nameof(ICircleTriangulationLogicOptions)}, But was: {nameof(options)}");
+            }
+        }
+    }
+}
diff --git a/StructureHelperLogics/NdmCalculations/Triangulations/CircleTriangulationLogicOptions.cs b/StructureHelperLogics/NdmCalculations/Triangulations/CircleTriangulationLogicOptions.cs
new file mode 100644
index 0000000..7b7fea2
--- /dev/null
+++ b/StructureHelperLogics/NdmCalculations/Triangulations/CircleTriangulationLogicOptions.cs
@@ -0,0 +1,38 @@
+using StructureHelperCommon.Models.Forces;
+using StructureHelperCommon.Models.Shapes;
+using StructureHelperLogics.NdmCalculations.Primitives;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperLogics.NdmCalculations.Triangulations
+{
+    public class CircleTriangulationLogicOptions : ICircleTriangulationLogicOptions
+    {
+        public ICircleShape Circle { get; }
+
+        public IPoint2D Center { get; }
+
+        public double NdmMaxSize { get; }
+
+        public int NdmMinDivision { get; }
+
+        public IStrainTuple Prestrain { get; set; }
+
+        public CircleTriangulationLogicOptions(ICirclePrimitive primitive)
+        {
+            Center = new Point2D() { X = primitive.CenterX, Y = primitive.CenterY };
+            Circle = primitive;
+            NdmMaxSize = primitive.NdmMaxSize;
+            NdmMinDivision = primitive.NdmMinDivision;
+            Prestrain = new StrainTuple
+            {
+                Kx = primitive.UsersPrestrain.Kx + primitive.AutoPrestrain.Kx,
+                Ky = primitive.UsersPrestrain.Ky + primitive.AutoPrestrain.Ky,
+                EpsZ = primitive.UsersPrestrain.EpsZ + primitive.AutoPrestrain.EpsZ
+            };
+        }
+    }
+}
diff --git a/StructureHelperLogics/NdmCalculations/Triangulations/ICircleTriangulationLogicOptions.cs b/StructureHelperLogics/NdmCalculations/Triangulations/ICircleTriangulationLogicOptions.cs
new file mode 100644
index 0000000..414792d
--- /dev/null
+++ b/StructureHelperLogics/NdmCalculations/Triangulations/ICircleTriangulationLogicOptions.cs
@@ -0,0 +1,18 @@
+using StructureHelperCommon.Models.Shapes;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperLogics.NdmCalculations.Triangulations
+{
+    internal interface ICircleTriangulationLogicOptions : IShapeTriangulationLogicOptions
+    {
+        /// <summary>
+        /// Shape
+        /// </summary>
+        ICircleShape Circle { get; }
+
+    }
+}
diff --git a/StructureHelperLogics/NdmCalculations/Triangulations/IRectangleTriangulationLogicOptions.cs b/StructureHelperLogics/NdmCalculations/Triangulations/IRectangleTriangulationLogicOptions.cs
index 66851dc..5f62a22 100644
--- a/StructureHelperLogics/NdmCalculations/Triangulations/IRectangleTriangulationLogicOptions.cs
+++ b/StructureHelperLogics/NdmCalculations/Triangulations/IRectangleTriangulationLogicOptions.cs
@@ -6,23 +6,11 @@ namespace StructureHelperLogics.NdmCalculations.Triangulations
     /// Parameter of triangulation of rectangle part of section
     /// Параметры триангуляции прямоугольного участка сечения
     /// </summary>
-    public interface IRectangleTriangulationLogicOptions : ITriangulationLogicOptions
+    public interface IRectangleTriangulationLogicOptions : IShapeTriangulationLogicOptions
     {
-        /// <summary>
-        /// 
-        /// </summary>
-        IPoint2D Center { get; }
         /// <summary>
         /// 
         /// </summary>
         IRectangleShape Rectangle { get; }
-        /// <summary>
-        /// Maximum size (width or height) of ndm part after triangulation
-        /// </summary>
-        double NdmMaxSize { get; }
-        /// <summary>
-        /// Minimum quantity of division of side of rectangle after triangulation
-        /// </summary>
-        int NdmMinDivision { get; }
     }
 }
diff --git a/StructureHelperLogics/NdmCalculations/Triangulations/IShapeTriangulationLogicOptions.cs b/StructureHelperLogics/NdmCalculations/Triangulations/IShapeTriangulationLogicOptions.cs
new file mode 100644
index 0000000..e1340a3
--- /dev/null
+++ b/StructureHelperLogics/NdmCalculations/Triangulations/IShapeTriangulationLogicOptions.cs
@@ -0,0 +1,25 @@
+using StructureHelperCommon.Models.Shapes;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperLogics.NdmCalculations.Triangulations
+{
+    public interface IShapeTriangulationLogicOptions : ITriangulationLogicOptions
+    {
+        /// <summary>
+        /// Center of shape
+        /// </summary>
+        IPoint2D Center { get; }
+        /// <summary>
+        /// Maximum size (width or height) of ndm part after triangulation
+        /// </summary>
+        double NdmMaxSize { get; }
+        /// <summary>
+        /// Minimum quantity of division of side of rectangle after triangulation
+        /// </summary>
+        int NdmMinDivision { get; }
+    }
+}
diff --git a/StructureHelperLogics/NdmCalculations/Triangulations/ITriangulationLogicOptions.cs b/StructureHelperLogics/NdmCalculations/Triangulations/ITriangulationLogicOptions.cs
index 513a185..ed4cc19 100644
--- a/StructureHelperLogics/NdmCalculations/Triangulations/ITriangulationLogicOptions.cs
+++ b/StructureHelperLogics/NdmCalculations/Triangulations/ITriangulationLogicOptions.cs
@@ -1,9 +1,9 @@
-namespace StructureHelperLogics.NdmCalculations.Triangulations
+using StructureHelperCommon.Models.Forces;
+
+namespace StructureHelperLogics.NdmCalculations.Triangulations
 {
     public interface ITriangulationLogicOptions
     {
-        double PrestrainKx { get;}
-        double PrestrainKy { get;}
-        double PrestrainEpsZ { get;}
+        IStrainTuple Prestrain { get; set; }
     }
 }
diff --git a/StructureHelperLogics/NdmCalculations/Triangulations/PointTriangulationLogic.cs b/StructureHelperLogics/NdmCalculations/Triangulations/PointTriangulationLogic.cs
index c682be6..964343d 100644
--- a/StructureHelperLogics/NdmCalculations/Triangulations/PointTriangulationLogic.cs
+++ b/StructureHelperLogics/NdmCalculations/Triangulations/PointTriangulationLogic.cs
@@ -25,7 +25,7 @@ namespace StructureHelperLogics.NdmCalculations.Triangulations
             List<INdm> ndmCollection = new List<INdm>();
             INdm ndm = new Ndm { CenterX = center.X, CenterY = center.Y, Area = area, Material = material };
             ndmCollection.Add(ndm);
-            NdmTransform.SetPrestrain(ndmCollection, new StrainMatrix() { Kx = Options.PrestrainKx, Ky = Options.PrestrainKy, EpsZ = Options.PrestrainEpsZ });
+            NdmTransform.SetPrestrain(ndmCollection, new StrainMatrix() { Kx = options.Prestrain.Kx, Ky = options.Prestrain.Ky, EpsZ = options.Prestrain.EpsZ });
             return ndmCollection;
         }
 
diff --git a/StructureHelperLogics/NdmCalculations/Triangulations/PointTriangulationLogicOptions.cs b/StructureHelperLogics/NdmCalculations/Triangulations/PointTriangulationLogicOptions.cs
index 1abae2e..49913e9 100644
--- a/StructureHelperLogics/NdmCalculations/Triangulations/PointTriangulationLogicOptions.cs
+++ b/StructureHelperLogics/NdmCalculations/Triangulations/PointTriangulationLogicOptions.cs
@@ -1,5 +1,6 @@
 using StructureHelperCommon.Infrastructures.Exceptions;
 using StructureHelperCommon.Infrastructures.Strings;
+using StructureHelperCommon.Models.Forces;
 using StructureHelperCommon.Models.Shapes;
 using StructureHelperLogics.Models.Primitives;
 using StructureHelperLogics.NdmCalculations.Primitives;
@@ -17,26 +18,27 @@ namespace StructureHelperLogics.NdmCalculations.Triangulations
         public IPoint2D Center { get; }
         /// <inheritdoc />
         public double Area { get; }
+        public IStrainTuple Prestrain { get; set; }
+
         /// <inheritdoc />
-        public double PrestrainKx { get; }
-        /// <inheritdoc />
-        public double PrestrainKy { get; }
-        /// <inheritdoc />
-        public double PrestrainEpsZ { get; }
 
         public PointTriangulationLogicOptions(IPoint2D center, double area)
         {
             Center = center;
             Area = area;
+            Prestrain = new StrainTuple();
         }
 
         public PointTriangulationLogicOptions(IPointPrimitive primitive)
         {
             Center = new Point2D() { X = primitive.CenterX, Y = primitive.CenterY };
             Area = primitive.Area;
-            PrestrainKx = primitive.UsersPrestrain.Kx + primitive.AutoPrestrain.Kx;
-            PrestrainKy = primitive.UsersPrestrain.Ky + primitive.AutoPrestrain.Ky;
-            PrestrainEpsZ = primitive.UsersPrestrain.EpsZ + primitive.AutoPrestrain.EpsZ;
+            Prestrain = new StrainTuple
+            {
+                Kx = primitive.UsersPrestrain.Kx + primitive.AutoPrestrain.Kx,
+                Ky = primitive.UsersPrestrain.Ky + primitive.AutoPrestrain.Ky,
+                EpsZ = primitive.UsersPrestrain.EpsZ + primitive.AutoPrestrain.EpsZ
+            };
         }
     }
 }
diff --git a/StructureHelperLogics/NdmCalculations/Triangulations/RectangleTriangulationLogic.cs b/StructureHelperLogics/NdmCalculations/Triangulations/RectangleTriangulationLogic.cs
index a11e435..bf6c69f 100644
--- a/StructureHelperLogics/NdmCalculations/Triangulations/RectangleTriangulationLogic.cs
+++ b/StructureHelperLogics/NdmCalculations/Triangulations/RectangleTriangulationLogic.cs
@@ -4,39 +4,44 @@ using System;
 using System.Collections.Generic;
 using LoaderCalculator.Data.Ndms.Transformations;
 using LoaderCalculator.Data.Matrix;
+using StructureHelperCommon.Infrastructures.Exceptions;
+using StructureHelperCommon.Infrastructures.Strings;
 
 namespace StructureHelperLogics.NdmCalculations.Triangulations
 {
     public class RectangleTriangulationLogic : IRectangleTriangulationLogic
     {
+        IRectangleTriangulationLogicOptions options;
         public ITriangulationLogicOptions Options { get; }
 
         public IEnumerable<INdm> GetNdmCollection(IMaterial material)
         {
-            IRectangleTriangulationLogicOptions rectangleOptions = Options as IRectangleTriangulationLogicOptions;
-            double width = rectangleOptions.Rectangle.Width;
-            double height = rectangleOptions.Rectangle.Height;
-            double ndmMaxSize = rectangleOptions.NdmMaxSize;
-            int ndmMinDivision = rectangleOptions.NdmMinDivision;
+            double width = options.Rectangle.Width;
+            double height = options.Rectangle.Height;
+            double ndmMaxSize = options.NdmMaxSize;
+            int ndmMinDivision = options.NdmMinDivision;
             LoaderCalculator.Triangulations.RectangleTriangulationLogicOptions logicOptions = new LoaderCalculator.Triangulations.RectangleTriangulationLogicOptions(width, height, ndmMaxSize, ndmMinDivision);
             var logic = LoaderCalculator.Triangulations.Triangulation.GetLogicInstance(logicOptions);
             var ndmCollection = logic.GetNdmCollection(new LoaderCalculator.Data.Planes.RectangularPlane { Material = material });
-            double dX = rectangleOptions.Center.X;
-            double dY = rectangleOptions.Center.Y;
-            NdmTransform.Move(ndmCollection, dX, dY);
-            double angle = rectangleOptions.Rectangle.Angle;
+            TriangulationService.CommonTransform(ndmCollection, options);
+            double angle = options.Rectangle.Angle;
             NdmTransform.Rotate(ndmCollection, angle);
-            NdmTransform.SetPrestrain(ndmCollection, new StrainMatrix() { Kx = Options.PrestrainKx, Ky = Options.PrestrainKy, EpsZ = Options.PrestrainEpsZ });
+            TriangulationService.SetPrestrain(ndmCollection, options.Prestrain);
             return ndmCollection;
         }
 
         public void ValidateOptions(ITriangulationLogicOptions options)
         {
-            throw new NotImplementedException();
+            if (options is not IRectangleTriangulationLogicOptions)
+            {
+                throw new StructureHelperException(ErrorStrings.DataIsInCorrect + $"\n Expected: {nameof(IRectangleTriangulationLogicOptions)}, But was: {nameof(options)}");
+            }
         }
 
         public RectangleTriangulationLogic(ITriangulationLogicOptions options)
         {
+            ValidateOptions(options);
+            this.options = options as IRectangleTriangulationLogicOptions;
             Options = options;
         }
     }
diff --git a/StructureHelperLogics/NdmCalculations/Triangulations/RectangleTriangulationLogicOptions.cs b/StructureHelperLogics/NdmCalculations/Triangulations/RectangleTriangulationLogicOptions.cs
index b7bf8a3..20bb04e 100644
--- a/StructureHelperLogics/NdmCalculations/Triangulations/RectangleTriangulationLogicOptions.cs
+++ b/StructureHelperLogics/NdmCalculations/Triangulations/RectangleTriangulationLogicOptions.cs
@@ -1,6 +1,7 @@
 using System;
 using StructureHelperCommon.Infrastructures.Exceptions;
 using StructureHelperCommon.Infrastructures.Strings;
+using StructureHelperCommon.Models.Forces;
 using StructureHelperCommon.Models.Shapes;
 using StructureHelperLogics.Models.Primitives;
 using StructureHelperLogics.NdmCalculations.Primitives;
@@ -19,11 +20,7 @@ namespace StructureHelperLogics.NdmCalculations.Triangulations
         /// <inheritdoc />
         public int NdmMinDivision { get; }
         /// <inheritdoc />
-        public double PrestrainKx { get;}
-        /// <inheritdoc />
-        public double PrestrainKy { get; }
-        /// <inheritdoc />
-        public double PrestrainEpsZ { get;}
+        public IStrainTuple Prestrain { get; set; }
 
         public RectangleTriangulationLogicOptions(IPoint2D center, IRectangleShape rectangle, double ndmMaxSize, int ndmMinDivision)
         {
@@ -31,6 +28,7 @@ namespace StructureHelperLogics.NdmCalculations.Triangulations
             Rectangle = rectangle;
             NdmMaxSize = ndmMaxSize;
             NdmMinDivision = ndmMinDivision;
+            Prestrain = new StrainTuple();
         }
 
         public RectangleTriangulationLogicOptions(IRectanglePrimitive primitive)
@@ -39,9 +37,12 @@ namespace StructureHelperLogics.NdmCalculations.Triangulations
             Rectangle = primitive;
             NdmMaxSize = primitive.NdmMaxSize;
             NdmMinDivision = primitive.NdmMinDivision;
-            PrestrainKx = primitive.UsersPrestrain.Kx + primitive.AutoPrestrain.Kx;
-            PrestrainKy = primitive.UsersPrestrain.Ky + primitive.AutoPrestrain.Ky;
-            PrestrainEpsZ = primitive.UsersPrestrain.EpsZ + primitive.AutoPrestrain.EpsZ;
+            Prestrain = new StrainTuple
+            {
+                Kx = primitive.UsersPrestrain.Kx + primitive.AutoPrestrain.Kx,
+                Ky = primitive.UsersPrestrain.Ky + primitive.AutoPrestrain.Ky,
+                EpsZ = primitive.UsersPrestrain.EpsZ + primitive.AutoPrestrain.EpsZ
+            };
         }
     }
 }
diff --git a/StructureHelperLogics/NdmCalculations/Triangulations/TriangulationService.cs b/StructureHelperLogics/NdmCalculations/Triangulations/TriangulationService.cs
new file mode 100644
index 0000000..d92481d
--- /dev/null
+++ b/StructureHelperLogics/NdmCalculations/Triangulations/TriangulationService.cs
@@ -0,0 +1,28 @@
+using LoaderCalculator.Data.Matrix;
+using LoaderCalculator.Data.Ndms;
+using LoaderCalculator.Data.Ndms.Transformations;
+using StructureHelperCommon.Models.Forces;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using static System.Windows.Forms.Design.AxImporter;
+
+namespace StructureHelperLogics.NdmCalculations.Triangulations
+{
+    internal static class TriangulationService
+    {
+        public static void SetPrestrain(IEnumerable<INdm> ndmCollection, IStrainTuple strainTuple)
+        {
+            NdmTransform.SetPrestrain(ndmCollection, new StrainMatrix() { Kx = strainTuple.Kx, Ky = strainTuple.Kx, EpsZ = strainTuple.Kx });
+        }
+
+        public static void CommonTransform(IEnumerable<INdm> ndmCollection, IShapeTriangulationLogicOptions options)
+        {
+            double dX = options.Center.X;
+            double dY = options.Center.Y;
+            NdmTransform.Move(ndmCollection, dX, dY);
+        }
+    }
+}
diff --git a/StructureHelperLogics/Services/NdmPrimitives/NdmPrimitivesService.cs b/StructureHelperLogics/Services/NdmPrimitives/NdmPrimitivesService.cs
index de61870..af71ab8 100644
--- a/StructureHelperLogics/Services/NdmPrimitives/NdmPrimitivesService.cs
+++ b/StructureHelperLogics/Services/NdmPrimitives/NdmPrimitivesService.cs
@@ -46,11 +46,9 @@ namespace StructureHelperLogics.Services.NdmPrimitives
         {
             //Настройки триангуляции
             ITriangulationOptions options = new TriangulationOptions { LimiteState = limitState, CalcTerm = calcTerm };
-
             //Формируем коллекцию элементарных участков для расчета в библитеке (т.е. выполняем триангуляцию)
             List<INdm> ndmCollection = new List<INdm>();
             ndmCollection.AddRange(Triangulation.GetNdms(primitives, options));
-
             return ndmCollection;
         }
     }
diff --git a/StructureHelperTests/FunctionalTests/Ndms/SteelSections/ReinforcementTest.cs b/StructureHelperTests/FunctionalTests/Ndms/SteelSections/ReinforcementTest.cs
index e8207fb..c815271 100644
--- a/StructureHelperTests/FunctionalTests/Ndms/SteelSections/ReinforcementTest.cs
+++ b/StructureHelperTests/FunctionalTests/Ndms/SteelSections/ReinforcementTest.cs
@@ -21,14 +21,47 @@ namespace StructureHelperTests.FunctionalTests.Ndms.SteelSections
         [TestCase(0.3, 0.6, 4e8, 0, 0, -1800000, 0d, 0d, -5e-5d)]
         [TestCase(0.3, 0.6, 4e8, 7000000, 0, 0, 0.0065882684745345067d, 0d, 0d)]
         //[TestCase(0.3, 0.6, 6e8, 10000000, 0, 0, 0.010485801788961743d, 0d, -0.00011114996218404612d)]
-        public void Run_ShouldPass(double width, double height, double strength, double mx, double my, double nz, double expectedKx, double expectedKy, double expectedEpsilonZ)
+        public void Run_ShouldPass_Rectangle(double width, double height, double strength, double mx, double my, double nz, double expectedKx, double expectedKy, double expectedEpsilonZ)
         {
             //Arrange
             var headMaterial = HeadMaterialFactory.GetHeadMaterial(HeadmaterialType.Reinforecement400, CodeTypes.EuroCode_2_1990);
-            ITriangulationOptions options = new TriangulationOptions { LimiteState = LimitStates.ULS, CalcTerm = CalcTerms.ShortTerm };
-            INdmPrimitive primitive = new RectanglePrimitive { CenterX = 0, CenterY = 0, Width = width, Height = height, HeadMaterial = headMaterial, NdmMaxSize = 1, NdmMinDivision = 100 };
-            List<INdmPrimitive> primitives = new List<INdmPrimitive>();
-            primitives.Add(primitive);
+            var options = new TriangulationOptions { LimiteState = LimitStates.ULS, CalcTerm = CalcTerms.ShortTerm };
+            var primitive = new RectanglePrimitive { CenterX = 0, CenterY = 0, Width = width, Height = height, HeadMaterial = headMaterial, NdmMaxSize = 1, NdmMinDivision = 100 };
+            var primitives = new List<INdmPrimitive>() { primitive};
+            var ndmCollection = Triangulation.GetNdms(primitives, options);
+            var loaderData = new LoaderOptions
+            {
+                Preconditions = new Preconditions
+                {
+                    ConditionRate = 0.01,
+                    MaxIterationCount = 100,
+                    StartForceMatrix = new ForceMatrix { Mx = mx, My = my, Nz = nz }
+                },
+                NdmCollection = ndmCollection
+            };
+            var calculator = new Calculator();
+            //Act
+            calculator.Run(loaderData, new CancellationToken());
+            var results = calculator.Result;
+            //Assert
+            Assert.NotNull(results);
+            var strainMatrix = results.StrainMatrix;
+            Assert.NotNull(strainMatrix);
+            Assert.AreEqual(expectedKx, strainMatrix.Kx, ExpectedProcessor.GetAccuracyForExpectedValue(expectedKx));
+            Assert.AreEqual(expectedKy, strainMatrix.Ky, ExpectedProcessor.GetAccuracyForExpectedValue(expectedKy));
+            Assert.AreEqual(expectedEpsilonZ, strainMatrix.EpsZ, ExpectedProcessor.GetAccuracyForExpectedValue(expectedEpsilonZ));
+        }
+
+        [TestCase(0.3, 4e8, 0, 0, 706850.84713269188d, 0d, 0d, 5e-5d)]
+        [TestCase(0.3, 4e8, 0, 0, -706850.84713269188d, 0d, 0d, -5e-5d)]
+        [TestCase(0.3, 4e8, 700000, 0, 0, 0.0076471604851248189d, 0d, 0d)]
+        public void Run_ShouldPass_Circle(double diameter, double strength, double mx, double my, double nz, double expectedKx, double expectedKy, double expectedEpsilonZ)
+        {
+            //Arrange
+            var headMaterial = HeadMaterialFactory.GetHeadMaterial(HeadmaterialType.Reinforecement400, CodeTypes.EuroCode_2_1990);
+            var options = new TriangulationOptions { LimiteState = LimitStates.ULS, CalcTerm = CalcTerms.ShortTerm };
+            var primitive = new CirclePrimitive { CenterX = 0, CenterY = 0, Diameter = diameter, HeadMaterial = headMaterial, NdmMaxSize = 1, NdmMinDivision = 100 };
+            var primitives = new List<INdmPrimitive>() { primitive };
             var ndmCollection = Triangulation.GetNdms(primitives, options);
             var loaderData = new LoaderOptions
             {