**Perimeter: calculating the perimeter of a triangle**

To calculate the perimeter of a triangle, all you have to do is add its three sides. If you have all the necessary information, you can solve such a problem in a matter of seconds, for example:

**Formula** **for the perimeter of a triangle:**

**P = Side 1 + Side 2 + Side 3.**

**If you give us a triangle whose sides have the following measurements:**

$AB = 5$

$BC = 8$

$CA = 6$

In this case, the perimeter of the triangle, which is the sum of the $3$ sides will be equal to. $19$