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)

# coding: utf-8

PI = 3.141592653589
r = float(input().strip())

temp = PI * r**2
area_ans = f'{temp:6f}'

temp = 2 * PI * r
circle_ans = f'{temp:6f}'

print(str(area_ans) + " " + str(circle_ans))