using System;

public class area

{

    public area(int r)

    {

        double arr;

        int rad=r;

        arr=3.14*r*r;

        Console.WriteLine("The area of circe is : "+arr);

    }

    public area(int a,int b)

    {

        double arr;

        int len,brea;

        len=a; brea=b;

        arr=len*brea;

        Console.WriteLine("The area of Rectangle is : "+arr);

    }

    public area(double c,double d )

    {

        double arr;

        double bas,height;

        bas=c; height=d;

        arr=0.5*bas*height;

        Console.WriteLine("The area of Triangle is : "+arr);

    }

}

public class Program

{

    public static void Main()

    {

        area p=new area(5);

        area p1=new area(5,10);

        area p2=new area(2,5);

    }

}