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;

/**
 * Created by khrom on 2017/06/14.
 */
public class Main {
    public static void main(String[] args) {
        double r = new Scanner(System.in).nextDouble();
        System.out.printf("%.6f %.6f", Math.PI * r * r, 2 * Math.PI * r);
    }
}