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;

public class Test
{
	public static void Main()
	{
            double pai = 3.141592653589;
            double r=0;
            double ensyuu = 0, menseki = 0;
            r = double.Parse(Console.ReadLine());
            menseki = r * r * pai;
            ensyuu = r * 2 * pai;
            Console.WriteLine("{0:0.000000} {1:0.000000}",menseki,ensyuu);
	}
}