import math
def circle_area(radius):
if radius > 0:
print('该圆的面积为:', math.pi*radius**2)
else:
print('请输入正确的半径')
radius = float(input('请输入圆的半径:'))
circle_area(radius)
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Ashen One
import math
def circle_area(radius):
if radius > 0:
print('该圆的面积为:', math.pi*radius**2)
else:
print('请输入正确的半径')
radius = float(input('请输入圆的半径:'))
circle_area(radius)