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.math.*;
import java.util.*;
public class Main {
    public static void main(String[] args){
        Scanner scan_ = new Scanner(System.in);
        String a = scan_.next();
        double a_ = Double.parseDouble(a);
        double menseki = a_ * a_ * 3.14159265358979323846;
        double enshuu = a_ * 2 * 3.14159265358979323846;
        System.out.println(
            String.format("%.8f" , menseki) + " " + String.format("%.8f" , enshuu)
        );
        
        
        
        
        }
      }