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;


namespace ConsoleApplication13
{
    class Program
    {
        static void Main(string[] args)
        {
            double x,y;
            String s = Console.ReadLine();
            double r = double.Parse(s);

            x = 2 * 3.141592653589 * r;
            y = 3.141592653589 * r * r;

            Console.WriteLine(y.ToString("F6") + " " + x.ToString("F6"));
        }
    }
}