Example: How to Find Area of a Circle with Diameter in Python using math.pi constant

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# How to Find Area of a Circle with Diameter in Python using math.pi constant
# Import math Library
import math

print("Enter the radius of the circle::\n")

r, d, c, a = float(input()), None, None, None
# r = radius, d = diameter, c = circumference, a = area

# It will calculate the diameter, circumference, and area
d = 2 * r
c = 2 * math.pi * r
a = math.pi * (r * r)

# It will print the final output
print("Diameter       = ", d, "units")
print("Circumference  = ", c, "units")
print("Area           = ", a, " sq. units")