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.*;
import java.text.*;
/*
Main class for AOJ where there is no input.
*/
public class Main{
   public static void main(String[] args){
      Scanner sc = new Scanner(System.in);
      double r = Double.parseDouble(sc.nextLine());
      DecimalFormat dot6 = new DecimalFormat("0.000000");
      double pi = Math.PI;
      
      double area = pi * r * r;
      double circumference = 2.0 * pi * r;
      
      System.out.println(dot6.format(area) + " " + dot6.format(circumference));  
      
   }//main
}//class