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)

#!/usr/local/bin/ruby

r = STDIN.gets
nr= r.to_i
puts (nr*nr*3.14159265359).to_s+ " " + ((nr+nr)*3.14159265359).to_s
# puts nr.class