python-by-example-150-chall.../challenges27-34/challenge-031.py

import math

radius = float(input('Enter circle radius : '))
# ** 表示幂计算
area = math.pi * (radius**2)
print(area)
first group of challenges 2019-07-17 14:56:46 +08:00			`import math`

			`radius = float(input('Enter circle radius : '))`
update 2025-05-26 06:49:34 +08:00			`# ** 表示幂计算`
first group of challenges 2019-07-17 14:56:46 +08:00			`area = math.pi * (radius**2)`
			`print(area)`