Adding assignments

Figures/Circle.cs

@@ -0,0 +1,22 @@
+namespace OOP.Figures
+{
+    public class Circle : Shape
+    {
+        public Circle(double radius)
+        {
+            this.radius = radius;
+        }
+
+        public double radius { get; set; }
+
+        public override double GetArea()
+        {
+            return Math.PI * Math.Pow(radius, 2);
+        }
+
+        public override double GetPerimeter()
+        {
+            return 2 * Math.PI * radius;
+        }
+    }
+}