Have you ever wondered who builds all the animal pens at the zoo? How does a zoo designer know how big to make the pens? Or, how do they determine the amount of fencing needed to build a pen that has an irregular shape?

The distance around a polygon is called the perimeter. To find the perimeter of any polygon you add the lengths of its sides. For example the perimeter of the irregular polygon below is 12 units.

Watch the video of Ms. Ruble describing her property.

- If her property is in the shape of a rectangle, what is the perimeter of her property?

Math Perimeter from Jen Ruble on Vimeo.