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 ConsoleApplication16
{
    class Program
    {
        static void Main(string[] args)
        {

            double d,e,r;


            string[] s = Console.ReadLine().Split(' ');
            r = double.Parse(s[0]);
            d = r*r*Math.PI;
            e = 2 * r * Math.PI;

            Console.WriteLine(d.ToString("F6")+" "+e.ToString("F6"));


        }
    }
}