Calculate Side Length AD in a Parallelogram with Perimeter 24cm and AB = 8

Each pair of opposite sides are parallel and equal.

AB is parallel to DC and therefore also AB = DC = 8.

We will use the given perimeter to find AD and BC—which are also equal and parallel to each other.

Let's now calculate the perimeter of the parallelogram:

$24=2AB+2AD$

$24=16+2AD$

$24-16=2AD$

$8=2AD$

Then, we'll divide the two sides by 2:

$\frac{8}{2}=\frac{2AD}{2}$

$AD=4$