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 Ruby (judge verdict: Wrong Answer)

r = gets.to_f
pi = Math.atan2(1, 1)*4;
include Math
pi2 = atan2(1, 1)*4
p = pi2
puts [p ** 2 * r, 2 * p * r].join ' '