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;

class Program
{
    static void Main()
    {
        var hline = double.Parse(Console.ReadLine());
        Console.WriteLine(string.Format(string.Format("{0:f6}", hline * hline * Math.PI) + " " + "{0:f6}", hline * 2 * Math.PI));
        
    }
}