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.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

    public static void main(String[] args) throws NumberFormatException, IOException{
        double r;
        try(BufferedReader br = new BufferedReader(new InputStreamReader(System.in))) {
            r = Double.parseDouble(br.readLine());
        }

        double s = Math.PI * r * r;
        double l = 2 * Math.PI * r;

        System.out.printf("%f %f%n", s, l);
    }
}