Problem:
Circle

Write a program which calculates the area and circumference of a circle for given radius r.

Input

A real number r is given.

Output

Print the area and circumference of the circle in a line. Put a single space between them. The output should not contain an absolute error greater than 10-5.

Constraints

0 < r < 10000

Sample Input 1

2

Sample Output 1

12.566371 12.566371

Sample Input 2

3

Sample Output 2

28.274334 18.849556

Solution in C# (judge verdict: Accepted)

using System;
using System.Collections.Generic;

class Program
{
    static void Main(string[] args)
    {

        String str = Console.ReadLine();
        double r = double.Parse(str);
        double pi = Math.PI;
        double men = 0;
        double shuu = 0;

        men = r * r * pi;
        shuu = 2 * pi * r;

        String strmen = string.Format("{0:f6}", men);
        String strshuu = string.Format("{0:f6}", shuu);

        Console.WriteLine("{0} {1}", strmen, strshuu);

    }
}