example programΒΆ
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# -*- coding: utf-8 -*-
"""
A module for working with circles.
"""
import math
def area(radius):
"""Calculates the area of a circle from its radius.
Example:
>>> area(51)
8171.28
Returns: float
"""
return math.pi * radius**2
def circumference(radius):
"""Calculates the circumference of a circle from its radius.
Example:
>>> circumference(51)
320.44
Returns: float
"""
return 2 * math.pi * radius
# Tests.
if __name__ == '__main__':
print(area(51))
print(circumference(51))