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;                                                                     
class Main {
 
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
          double a = in.nextDouble();
          double c = (double)2*3.141592653589*a;
          double b = (double)a*a*3.141592653589;
          System.out.println(String.format("%.6f",b) + " " +String.format("%.6f",c));
    }
}