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.util.Scanner;
class Main{
    public static void main(String[] args){
  
            Scanner scan = new Scanner(System.in);
  
            double r =  scan.nextDouble();
            double s,l,p = 3.141592653589;
          
            s = r*r*p;
            l = 2*r*p;
  
           System.out.printf("%f %f\n",s,l);
        }
}