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.io.*;
import java.util.*;

class Main { 
public static void main (String[] args){
  Scanner scan = new Scanner(System.in);

  double r = scan.nextDouble();
  double x = Math.PI;

  System.out.printf("%.5f %.5f\n",r * r * x,r * 2 * x);

}
}