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;
 
public class Main {
  public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
    double r = in.nextDouble();
     
    double square = Math.PI * r * r ;
    double perimeter = Math.PI * 2 * r;
    
    System.out.printf("%5.6f", square);
    System.out.printf(" %5.6f\n", perimeter);
  }
}