using System;

​

public class Program

{

    public static void Main()

    {

        Double r, pie;

        Console.WriteLine("ادخل قيمة r = ");

        r = Double.parse(Console.ReadLine());

        pie = 3.14;

        Double s = (Math.pow(r, 2) * pie);

        Console.WriteLine("s,مساحة الدائرة = {0}");

        double p = (r * 2) * pie;

        Console.WriteLine("p,{0} = محيط الدائرة");

    }

}