Jack Black describes an octagon. He finds everyday figures, like a stop sign, to describe the attributes of this shape. It is a great way to launch a discussion of geometric Math .

What makes a figure a polygon? Does it have three or more sides? Is it a closed figure? If the answer is yes to both of those questions then it's a polygon. But wait! Some of these polygons have special names based on the number of sides...

This tutorial explains the properties of a polygon, the names of the most popular polygons, and teaches how to identify polygons. [5:41]