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 Class1
	{
		public static void Main(String[] args)
		{
			double r =double.Parse(Console.ReadLine());
			double b=2d*r*Math.PI;
			double a=r*r*Math.PI;
			Console.WriteLine("{0:f5} {1:f5}",a,b);
			
			
			
		}
	}