C# Online Compiler | .NET Fiddle

using System;
	
public interface IComponent
{
    void Render();
    IComponent Clone();
}

public class Circle : IComponent
{
    public int Radius { get; set; }

    public IComponent Clone()
    {
        Circle newCircle = new Circle();
        newCircle.Radius = Radius;
        return newCircle;
    }

    public void Render()
    {
        Console.WriteLine("Rendering a Circle");
    }
}

public class ContextMenu
{
    public void Duplicate(IComponent component)
    {
        IComponent newComponent = component.Clone();
		Console.Write("component duplicated/cloned");
        //Add target to document
    }
}


public class Program
{
	public static void Main()
	{
		Circle circle = new Circle() { Radius = 10 };
		ContextMenu cmenu = new ContextMenu();
		cmenu.Duplicate(circle);
	}
}

a=10  b=20
sum=30    pr=200
a=10  b=20 c=30
sum=60    pr=6000