In this post, we will learn how to find the area of a circle using the Python Programming language.

As we know, the area of a circle is **πr ^{2}**, where

**r**is the radius of the circle and

**π = 22/7 or 3.14**.

Since **π** is a constant, we need to take only the radius value as input.

We can import the value of **π** using a math module or assign the value of **π** to a separate constant variable.

This tutorial takes the radius of the circle from the user and calculates the area of the circle using the following approaches:

- Using Constant π
- Using math Module

So, without further ado, let’s begin this tutorial.

**Python Program to Find Area of Circle Using Constant π**

# Python Program to Find Area of Circle Using Constant π PI = 3.14 r = float(input("Enter the radius of the circle: ")) area = PI * r * r print("Area of the circle = %.2f" %area)

**Output**

```
Enter the radius of the circle: 14
Area of the circle = 615.44
```

**How Does This Program Work?**

- In this program, we store the value of
**π**in the**PI**named constant variable. - Now, the user is asked to enter the radius of the circle. It is stored in the
**r**named variable. - The area of the circle is calculated using the formula
**πr**. The area of the circle is stored in the^{2}**area**named variable. - The calculated area of the circle is printed up to
**2**decimal places with the help of**%.2f**format specifier.

**Python Program to Find Area of Circle Using math Module**

In the above program, we have stored the value of **π** in a separate variable. To get more precise and accurate results, we will use the **math** module.

Python has a built-in module called **math** that provides access to different mathematical constants and functions. It also contains the value of **π**.

# Python Program to Find Area of Circle Using math Module import math r = float(input("Enter the radius of a circle: ")) area = math.pi * r * r print("Area of the circle = %.2f" %area)

**Output**

```
Enter the radius of a circle: 7
Area of the circle = 153.94
```

To use the value of **π**, use **math.pi** in the program.

**Summary**

After going through this post, I hope you understand how to find the area of a circle using the Python Programming language.