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 sc = new Scanner(System.in);
            double r = sc.nextDouble();
            double d = r*r*Math.PI;
            double f = r*2*Math.PI;
             System.out.println(String.format("%.6f",d)+" "+String.format("%.6f",f));
   }
 }