using System;

        static class Rectangle

        {

            static public double Lice2(double a,double b)

            {return a*b;}

            static public double Obem2(double a,double b)

            {return a*a+(b*b);}

        }

​

     static class Square

     {

        static public double Lice(double R)

        {return R*R;}

         static public double Obem(double R)

         {return R*4;}

     }

​

    static class Circle

    {static private double pi=3.1416;

     static public double Perimeter(double R)

     {return 2*pi*R;}

     static public double Face(double R)

     {return pi*R*R;}

    }

static class Sphere

{

    static private double pi=3.1416;

    static public double Surface(double R)

    {return 4*pi*R*R;}

    static public double Volume(double R)

    {return 4*pi*R*R*R/3;}

}

​

public class Program

{

    public static void Main()

    {

        double r,s,a,b;

        Console.WriteLine("Vuvedi radius:");

        r=double.Parse(Console.ReadLine());

        Console.WriteLine("Vuvedi strana:");

        s=double.Parse(Console.ReadLine());

        Console.WriteLine("Vuvedi strana a:");

        a=double.Parse(Console.ReadLine());

        Console.WriteLine("Vuvedi strana b:");

        b=double.Parse(Console.ReadLine());

        Console.WriteLine("Perimetur na kruga e {0:F2}",Circle.Perimeter(r));

        Console.WriteLine("Liceto na kruga e {0:F2}",Circle.Face(r));

        Console.WriteLine("Povurhnostta na kulboto e {0:F2}",Sphere.Surface(r));

        Console.WriteLine("Obema na kulboto e {0:F2}",Sphere.Volume(r));

        Console.WriteLine("Liceto na kvadrata e {0:F2}",Square.Lice(s));

        Console.WriteLine("Perimetura na kvadrata e {0:F2}",Square.Obem(s));

        Console.WriteLine("Liceto na pravougulnika e {0:F2}",Rectangle.Lice2(a,b));

        Console.WriteLine("Perimetura na pravougulnika e {0:F2}",Rectangle.Obem2(a,b));

    }

}