### Python program to find the circumference of a circle :

In this tutorial, we will learn how to find the circumference of a circle in python 3. The formulae to calculate circumference is *‘2 * Pi * radius’.* So, we need only the value of *radius* to calculate the circumference. We will take this input from the user. Let’s take a look :

### Python program :

import math radius = float(input("Enter radius of the circle : ")) circumference = 2 * math.pi * radius print("Circumference of the circle is : %.2f" % circumference)

### Example Output :

Enter radius of the circle : 5 Circumference of the circle is : 31.42 Enter radius of the circle : 10 Circumference of the circle is : 62.83 Enter radius of the circle : 0 Circumference of the circle is : 0.00 Enter radius of the circle : 1200 Circumference of the circle is : 7539.82 Enter radius of the circle : 12.5 Circumference of the circle is : 78.54

### Explanation :

1. First take the *radius input* from the user. The radius is a *floating* value. So, we are using ‘*float(input())*‘.

2. Calculate the *circumference*. The value of Pi is taking from ‘*math*‘ module of python. ‘*math.pi*‘ gives the value of pi.

3. Print the value of the circumference. The value is formatted up to *two decimal places using %.2f .*