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,m,s;
	Scanner scan = new Scanner(System.in);
	
	r= scan.nextDouble();
	
	m=r*r*Math.PI;
	s=2*r*Math.PI;
	System.out.printf("%f %f",m,s);
	}
	
}