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 JAVA (judge verdict: Accepted)

import java.util.Scanner;
class Main
 {
   public static void main(String[] args)
  	{
   Scanner S = new Scanner(System.in);
  	double r = S.nextDouble();
  	System.out.printf("%.6f %.6f\n", r * r * Math.PI, r * 2 * Math.PI);
}
}