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 Python3 (judge verdict: Accepted)

import math
r = float(input())
t = r**2 * math.pi
s = 2 * r * math.pi
print(str("{0:.8f}".format(t)) + " " + str("{0:.8f}".format(s)))