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()
        {
            string line = Console.ReadLine();
            double r = double.Parse(line);

            double area = r * r * Math.PI;
            double around = 2 * Math.PI * r;

            Console.WriteLine(area.ToString("F5") + " " + around.ToString("F5"));
        }
    }