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.io.*;
class Main
{
    public static void main (String[ ] args) throws Exception
    {
        BufferedReader br = new BufferedReader (new InputStreamReader (System.in));
         
        double r = Double.parseDouble(br.readLine());
         
        double b = Math.PI * r * r;
        double c = 2 * Math.PI * r;
 
        System.out.printf("%.5f %.5f\n", b, c);
    }
}