How do I find the area of a pentagon

When finding the area of a pentagon you will have to cut the pentagon into 10 pieces and take one of the small pieces and if you were told the length of the other side multiply both of them up. Btw it's very diffucult to explain it but very easy to do it when you get the hang of it. Sorry if I confused you more I confused myself a bit.

You multiply the length and the width