 # Python Program Input Radius of Circle and Compute the Area

Python program to input radius of a circle and calculate its area; Through this tutorial, you will learn how to calculate area of circle using inputted radius in python.

The area of a circle is the number of square units inside that circle. If each square in the circle to the left has an area of 1 cm2, you could count the total number of squares to get the area of this circle.

The area of a circle can be found by multiplying pi ( π = 3.14) by the square of the radius. e.g. If a circle has a radius of 5, its area is 3.14*5*5=78.53.

## Python Program Input Radius of Circle and Calculate the it’s Area

• Algorithm to find the Area of a circle in python
• Python program which accept the radius of a circle from the user and computes the area

### Algorithm to find the Area of a circle in python

Use the following algorithm and write a program to input radius of a circle and calculate its area in python:

• Import math module in python program.
• Take input number from user.
• Calculate area of the circle with a given radius by using formula pi * r**2.
• Print result.

### Python program which accept the radius of a circle from the user and compute the area

```# import math module
from math import pi

# take input from user
r = float(input ("Input the radius of the circle : "))

# compute the area from radius of a circle given by user
calculateArea = str(pi * r**2);

#print result
print ("The area of the circle with radius " + str(r) + " is: " + calculateArea)

```

After executing the program, the output will be:

```Input the radius of the circle :  2
The area of the circle with radius 2.0 is: 12.566370614359172```

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