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: Wrong Answer)

using System;
class Aoj
{
    static void Main()
    {
        float r = float.Parse(Console.ReadLine());
        double y = r * r * 3.14;
        double k = r * 2 * 3.14;
        Console.WriteLine(y + "\n" + k);
    }
}