## Find the perimeter of a triangle in Python :

In this python programming tutorial, we will learn how to find out the *perimeter* of a triangle using_ user-provided_ values. The program will take the inputs from the user and print out the result.

## How to calculate the perimeter of a triangle :

The perimeter of a triangle is the sum of all of its sides. Letâ€™s take a look at the below image :

The length of its sides is *4cm*,*5cm _and _4cm*. So, the perimeter is *4 + 5 + 4 = 13cm*. Our program will take the *three* sides as input from the user and print out the *perimeter* as output.

### Python program :

```
a = float(input("Enter the length of the first side in cm : "))
b = float(input("Enter the length of the second side in cm : "))
c = float(input("Enter the length of the third side in cm : "))
perimeter = a + b + c
print("The perimeter of the triangle is {} ".format(perimeter))
```

### Sample Output :

```
Enter the length of the first side in cm : 5
Enter the length of the second side in cm : 4
Enter the length of the third side in cm : 4
The perimeter of the triangle is 13.0
Enter the length of the first side in cm : 40
Enter the length of the second side in cm : 90
Enter the length of the third side in cm : 100
The perimeter of the triangle is 230.0
Enter the length of the first side in cm : 3
Enter the length of the second side in cm : 3
Enter the length of the third side in cm : 3
The perimeter of the triangle is 9.0
```