Добавил примитив для точки

StructureHelperLogics/Data/Shapes/IPoint.cs

@@ -6,6 +6,6 @@ namespace StructureHelperLogics.Data.Shapes
 {
     public interface IPoint : IShape
     {
-        double Area { get; }
+        double Area { get; set; }
     }
 }

StructureHelperLogics/Models/NdmPrimitives/IPrimitive.cs

@@ -0,0 +1,15 @@
+using StructureHelperLogics.Data.Shapes;
+using StructureHelperLogics.NdmCalculations.Entities;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace StructureHelperLogics.Models.NdmPrimitives
+{
+    public interface IPrimitive
+    {
+        ICenter Center { get;}
+        IShape Shape { get;}
+        INdmPrimitive GetNdmPrimitive();
+    }
+}

StructureHelperLogics/Models/NdmPrimitives/PointPrimitive.cs

@@ -0,0 +1,50 @@
+using StructureHelperLogics.Data.Shapes;
+using StructureHelperLogics.NdmCalculations.Entities;
+using StructureHelperLogics.NdmCalculations.Materials;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace StructureHelperLogics.Models.NdmPrimitives
+{
+    public class PointPrimitive : IPrimitive
+    {
+        ICenter _center;
+        IShape _shape;
+
+        public ICenter Center => _center;
+        public IShape Shape => _shape;
+        public double Area
+        {
+            get
+            {
+                IPoint point = _shape as IPoint;
+                return point.Area;
+            }
+            set
+            {
+                IPoint point = _shape as IPoint;
+                point.Area = value;
+            }
+        }
+
+        public PointPrimitive(ICenter center, IShape shape)
+        {
+            _center = center;
+            _shape = shape;
+        }
+        public INdmPrimitive GetNdmPrimitive()
+        {
+            double strength = 400;
+            string materialName = "s400";
+            IPrimitiveMaterial primitiveMaterial = new PrimitiveMaterial() { MaterialType = GetMaterialTypes(), ClassName = materialName, Strength = strength }; ;
+            INdmPrimitive ndmPrimitive = new NdmPrimitive() { Center = _center, Shape = _shape, PrimitiveMaterial = primitiveMaterial };
+            return ndmPrimitive;
+        }
+
+        private MaterialTypes GetMaterialTypes()
+        {
+            return MaterialTypes.Reinforcement;
+        }
+    }
+}