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 PHP (judge verdict: Accepted)

<?php
$r=trim(fgets(STDIN));
printf("%f %f",$r*$r*pi(),2*$r*pi());
#printf("%f %f",M_PI*$r*$r,M_PI*2*$r);
?>