Making sure it uses Microsoft Code Convention

Figures/Circle.cs

@@ -4,19 +4,19 @@ namespace OOP.Figures
     {
         public Circle(double radius)
         {
-            this.radius = radius;
+            Radius = radius;
         }
 
-        public double radius { get; set; }
+        public double Radius { get; set; }
 
         public override double GetArea()
         {
-            return Math.PI * Math.Pow(radius, 2);
+            return Math.PI * Math.Pow(Radius, 2);
         }
 
         public override double GetPerimeter()
         {
-            return 2 * Math.PI * radius;
+            return 2 * Math.PI * Radius;
         }
     }
 }