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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