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

def area(r) -> float:
    return math.pi * r ** 2

def circumference(r) -> float:
    return 2 * math.pi * r

r = float(input())
print("%.5f %.5f" % (area(r), circumference(r)))