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) {

		double r = 0;

		Scanner in = new Scanner(System.in);

		r = in.nextDouble();

		double a =  r * r * Math.PI;
		double b =  2 * r * Math.PI;

		String A =  String.format("%f", a);
		String B =  String.format("%f", b);

		System.out.println(A + " " + B);

	}

}