What kind of geometry shapes are you familiar with?Here's a short and very helpful video that explains how we classify and name polygons by the number of sides they have.
Here are several hand made manipulatives below that you can cut print off and cut out for hands-on activity.
Cut along the solid lines! If you color your pieces, a triangle is green, a square is orange, and the smaller rhombus in a set of pattern blocks is beige.