# What is the formula for finding the perimeter of a triangle?

$l + l ' + w$
Every triangle has three sides, hence the name, and to find the perimeter, you add up the values of all three sides. I call the three sides $\text{width}$, $\text{length}$, and $\text{length prime}$, respectively.
$l + l ' + w$ $\to$ $3 + 4 + 5$