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)

pi = 3.14159265358979323846264338327950288

r = float(input())

S = pi * r * r
L = 2 * pi * r

print('{:.6f}'.format(S), '{:.6f}'.format(L))