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: Accepted)

radius = gets.to_f;
pi = Math::PI;
 
area = radius * radius * pi;
len = 2 * radius * pi;
 
puts "%.6f" % area + " " +  "%.6f" % len;