Python Program to Find Area and Circumference of Circle using Radius

In this python post, we would love to share with you how to find diameter circumference and area Of a circle.

The mathematical formulas are:

1. Diameter of a Circle = 2r = 2 * radius
2. Area of a circle is: A = πr² =  π * radius * radius
3. Circumference of a Circle = 2πr = 2 * π * radius

Python Program to Find Area and Circumference of Circle

Let’s follow the following algorithm to write a program to calculate the circumference of a circle in python:

• Python Program to find Diameter Circumference and Area Of a Circle
• Python Program to Calculate Diameter Circumference and Area Of a Circle

Python Program to find Diameter Circumference and Area Of a Circle

• Allow users to input the radius of a circle.
• Using the radius value, this Python formula to calculate the Circumference, Diameter, and Area Of a Circle, Diameter of a Circle = 2r = 2 * radius, Area of a circle are: A = πr² =  π * radius * radius and Circumference of a Circle = 2πr = 2 * π * radius.
• Print result.

# Python Program to find Diameter, Circumference, and Area Of a Circle

PI = 3.14
radius = float(input(' Please Enter the radius of a circle: '))

diameter = 2 * radius
circumference = 2 * PI * radius
area = PI * radius * radius

print(" \nDiameter Of a Circle = %.2f" %diameter)
print(" Circumference Of a Circle = %.2f" %circumference)
print(" Area Of a Circle = %.2f" %area)

After executing the python program, the output will be:

Please Enter the radius of a circle:  5
 
Diameter Of a Circle = 10.00
Circumference Of a Circle = 31.40
Area Of a Circle = 78.50

Python Program to Calculate Diameter Circumference and Area Of a Circle

# Python Program to find Diameter, Circumference, and Area Of a Circle
import math

def find_Diameter(radius):
    return 2 * radius

def find_Circumference(radius):
    return 2 * math.pi * radius

def find_Area(radius):
    return math.pi * radius * radius

r = float(input(' Please Enter the radius of a circle: '))

diameter = find_Diameter(r)
circumference = find_Circumference(r)
area = find_Area(r)

print("\n Diameter Of a Circle = %.2f" %diameter)
print(" Circumference Of a Circle = %.2f" %circumference)
print(" Area Of a Circle = %.2f" %area)

After executing the python program, the output will be:

 Please Enter the radius of a circle:  56

 Diameter Of a Circle = 112.00
 Circumference Of a Circle = 351.86
 Area Of a Circle = 9852.03