Program to calculate the area of a circle based on the user input for the radius in Python

Python program that calculates the area of a circle based on the user input for the radius:

import math

radius = float(input("Enter the radius of the circle: "))

area = math.pi * radius ** 2

print(f"The area of the circle is {area:.2f}.")

In this program, we first import the math module to use the value of pi. Then, we get input from the user for the radius of the circle using the input() function, and convert the input value to a float data type. We then use the formula for the area of a circle, A = pi * r^2, to calculate the area and store it in the variable area. Finally, we use the print() function to display the result to the user, with the f-string format to round the result to two decimal places.

You can run this program in a Python interpreter or save it as a .py file and run it in the command line to calculate the area of a circle for different radius values.

The output of the program would be:

Enter the radius of the circle: 5

The area of the circle is 78.54.

This means that the area of the circle with radius 5 is approximately 78.54 square units. The result is rounded to two decimal places using the f-string format. You can test this program with different radius values to calculate the corresponding areas of circles.