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 Python (judge verdict: Accepted)

import math

class Circle:
    def output(self, r):
        print "%.6f %.6f" % (math.pi * r * r, 2.0 * math.pi * r)

if __name__ == "__main__":
    cir = Circle()
    r = float(raw_input())
    cir.output(r)