Polygons
Polygons are another name for a shape with sides. Polygons are closed shapes and they have sides. Circles are not polygons because they do not have sides, they are round.
Here are some of the basic polygons:
Here's a hard one, this shape is a dodecagon (doh-deck-uh-gon). Guess how many sides this polygon has? (Put your cursor over the image to find out!)