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 IOException{
        
        double r;
        double men, shu;
        
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String str = br.readLine();
        
        r = Double.parseDouble(str);
        
        men = r * r * Math.PI;
        shu = 2 * r * Math.PI;
        
        System.out.printf("%1.6f %1.6f", men, shu);
    }
}