python calculate area of circle

How to calculate the area of a circle using python?

First of all, we need to know the formula for calculating the area of a circle: S = πr². In the formula, S is the area of the circle required, π is the pi ratio, and r is the radius of the circle.

Example

# 定义一个方法来计算圆的面积 def findArea(r): PI = 3.142 return PI * (r*r); # 调用方法 print("圆的面积为 %.6f" % findArea(5));

In the above example we defined a findArea() function, the parameter r is the radius of the circle, the pi is 3.142, and the return value of the function is PI * (r *r), which is the area of the circle.

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