Program 12: Calculate Area and Circumference of Circle - 1000+ Python Programs

In this program number 12 in our series, let's calculate the area of a circle, as well as its circumference.

Area of Circle: π x r2

Circumference of Circle: 2 x π x r

As the value of PI is a constant 3.14 all that we need to get from the user as input is the radius of the circle.

Python Code

Program 12
- Write a Python program
  Calculate Area and 
  Circumference of Circle

  1000+ Python Programs by


PI = 3.142

print("Program to calculate Area and Circumference of Circle");
radius = int(input("Enter the radius of Circle : "))

# Formula of the area of Circle
area = PI*radius*radius

# Formula of the circumference of Circle
circumference = 2*PI*radius

print("The Area of a circle with radius ", radius, " is ", area)
print("Circumference of a circle with ", radius, " is ", circumference)
Output Example:

Program to calculate the Area and Circumference of Circle
Enter the radius of Circle: 10
The area of a circle with a radius of 10 is 314.2
Circumference of a circle with 10 is 62.839999999999996

Python build-in functions used in this program

  • print() - an inbuild function in Python 3 - read more, we can also use of the f-strings along with print function to get the desired result.
  • input(prompt) - an inbuild function again, with the prompt string that is printed out to the standard output without a trailing newline - read more
Code Example area and circumference of Circle in Python

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