Добавил тест для прямоугольника

StructureHelperLogics/Data/Shapes/Center.cs

@@ -8,8 +8,8 @@ namespace StructureHelperLogics.Data.Shapes
     public class Center : ICenter
     {
         /// <inheritdoc />
-        public double CenterX { get; set; }
+        public double X { get; set; }
         /// <inheritdoc />
-        public double CenterY { get; set; }
+        public double Y { get; set; }
     }
 }

StructureHelperLogics/Data/Shapes/ICenter.cs

@@ -14,11 +14,11 @@ namespace StructureHelperLogics.Data.Shapes
         /// Coordinate of center of rectangle by local axis X, m
         /// Координата центра вдоль локальной оси X, м
         /// </summary>
-        double CenterX { get;}
+        double X { get;}
         /// <summary>
         /// Coordinate of center of rectangle by local axis Y, m
         /// Координата центра вдоль локальной оси Y, м
         /// </summary>
-        double CenterY { get;}
+        double Y { get;}
     }
 }

StructureHelperLogics/Data/Shapes/ICenterShape.cs

@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace StructureHelperLogics.Data.Shapes
+{
+    public interface ICenterShape
+    {
+        ICenter Center {get;}
+        IShape Shape { get;}
+    }
+}

StructureHelperLogics/Data/Shapes/ICircle.cs

@@ -0,0 +1,11 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace StructureHelperLogics.Data.Shapes
+{
+    public interface ICircle : IShape
+    {
+        double Diameter { get; set; }
+    }
+}

StructureHelperLogics/Data/Shapes/IPoint.cs

@@ -0,0 +1,11 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace StructureHelperLogics.Data.Shapes
+{
+    public interface IPoint : IShape
+    {
+        double Area { get; set; }
+    }
+}

StructureHelperLogics/Data/Shapes/IRectangle.cs

@@ -4,7 +4,7 @@ using System.Text;
 
 namespace StructureHelperLogics.Data.Shapes
 {
-    public interface IRectangle
+    public interface IRectangle : IShape
     {
         /// <summary>
         /// Width of rectangle, m

StructureHelperLogics/Data/Shapes/IShape.cs

@@ -0,0 +1,10 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace StructureHelperLogics.Data.Shapes
+{
+    public interface IShape
+    {
+    }
+}

StructureHelperLogics/Data/Shapes/Point.cs

@@ -0,0 +1,11 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace StructureHelperLogics.Data.Shapes
+{
+    public class Point : IPoint
+    {
+        public double Area { get; set; }
+    }
+}