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;

public class Hello{
    public static void Main(){
        // Here your code !
        // your code goes here
		string line = System.Console.ReadLine();
		string[] ab = line.Split(' ');
		decimal r = Convert.ToDecimal(ab[0]);
		decimal pi = Convert.ToDecimal(Math.PI);
		decimal s = pi*r*r;
		decimal l = 2.0m*pi*r;
		Console.WriteLine("{0:F6} {1:F6}",s,l);
		
    }
}