# If a regular triangle has a perimeter of 15x+84, what is an expression for the length of one of its sides?

Jan 11, 2017

side = $5 x + 28$

#### Explanation:

A regular triangle has 3 sides which are equal in length and the size of each angle is 60°

TO find the length of one side, divide the perimeter by 3.

side = $\frac{15 x + 84}{3}$

$= 5 x + 28$

An exact answer cannot be calculated until the value of $x$ is known.