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
$format = "%f %f".PHP_EOL;
fscanf(STDIN, "%f", $a);
$area = $a * $a * M_PI;
$line = $a * 2 * M_PI;
printf($format, $area, $line);