Python program to enter the radius of a circle and find its diameter, circumference, and area. There are you will learn how to find the diameter, circumference, and area of a circle in Python language.
Formula:
D = 2 * r
C = 2 * PI * r
A = PI * r2
where:
r = radius of the circle
D = diameter of the circle
C = circumference of the circle
A = area of the circle
There are two ways to implement these formulae:
- By using the default value of PI = 3.14
- Second, by using math.pi constant
1. By using the default value of PI = 3.14
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# Python program to find diameter, circumference, and area of a circle 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 # Calculation of diameter, circumference and area d = 2 * r c = 2 * 3.14 * r a = 3.14 * (r * r) print("Diameter = ", d, "units") print("Circumference = ", c, "units") print("Area = ", a, " sq. units") |
Output:
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Enter the radius of the circle:: 7 Diameter = 14.0 units Circumference = 43.96 units Area = 153.86 sq. units |
2. By using math.pi constant
Note: before using math.pi constant you have to import math library in the program
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# Python program to find diameter, circumference, and area of a circle # 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 # Calculation of diameter, circumference and area d = 2 * r c = 2 * math.pi * r a = math.pi * (r * r) print("Diameter = ", d, "units") print("Circumference = ", c, "units") print("Area = ", a, " sq. units") |
Output:
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Enter the radius of the circle:: 7 Diameter = 14.0 units Circumference = 43.982297150257104 units Area = 153.93804002589985 sq. units |
