First of all, we need to know the formula for calculating the area of a circle: S = πr², where S is the area of the circle to be sought, π is the circumference of the circle, and r is the radius of the circle.
Example:
# Define a method to calculate the area of the circle
def findArea(r):
PI =3.142return PI *(r*r);
# Call method
print("The area of the circle is%.6f"%findArea(5));
In the above example, we define a findArea() method, 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.
Example extension:
PYTHON calculates the area of a circle
Two ways to introduce pi:
method one:
import math
print(math.pi)
Method Two:
from math import pi
print(pi)
Code to calculate the area of a circle:
# Calculate the area of the circle
from math import pi
r=float(input('Enter the length of the radius:'))
area=pi*r**2print('Area of output circle:',area)
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