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.*;
class Main{
    public static void main(String[] args){
        Scanner scan=new Scanner(System.in);
        double r,area,cir;
        r=scan.nextDouble();
        area = Math.PI * (r * r);
        cir= Math.PI * (2 * r);
        System.out.printf("%.5f %.5f\n",area,cir);
    }
}