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 IOException {

        BufferedReader std = new BufferedReader(new InputStreamReader(System.in));
        
        double r = Double.parseDouble(std.readLine());
        
        double b = Math.PI * r * r;
        double c = 2 * Math.PI * r;
        
        System.out.printf("%.5f %.5f\n", b,c);
        
    }
}