using System;

class Testclass

{

public class Dimensions

{

public const double pi=Math.PI;

protected double x,y;

public Dimensions()

{

}

public Dimensions (double x,double y)

{

this.x=x;

this.y=y;

}

public virtual Double Area()

{

return x*y;

}

}

public class circle:Dimensions

{

public circle(double r):base(r,0)

{

}

public override double Area()

{

return pi*x*x;

}

}

class sphere:Dimensions

{

public sphere(double r):base (r,0)

{

}

public override double Area()

{

return 4*pi*x*x;

}

}

class cylinder:Dimensions

{

public cylinder (double r,double h):

base (r,h)

{

}

public override double Area()

{

return 2*pi*x*x+2*pi*x*y;

}

}

public static void Main()

{

double r=3.0,h=5.0;

Dimensions c=new circle(r);

Dimensions s=new sphere(r);

Dimensions l=new cylinder(r,h);

Console.WriteLine("Area of circle={0:f2}",c.Area());

Console.WriteLine(c.Area());

Console.WriteLine("Area of sphere={0:f2}",s.Area());

Console.WriteLine("Area of cylinder={0:f2}",l.Area());

}

}