Shapes.Circle.CalculateSurface C# (CSharp) Method

        public override double CalculateSurface()
        {
            return 2 * Math.PI * this.Height;
        }
    }

 public static void Main()
 {
     Triangle triangle = new Triangle(4, 5);
     Console.WriteLine(triangle.CalculateSurface());
     var rectangle = new Rectangle(3, 5);
     Console.WriteLine(rectangle.CalculateSurface());
     var circle = new Circle(4);
     Console.WriteLine("{0:F2}", circle.CalculateSurface());
 }