If you need to review geometric shapes and perimeter, this is an easy-to-use card game that will do both. (You can also use just the geometric shape cards.) Print out the cards onto card stock or laminate copy paper before using to increase the life of your cards. The cards feature two different triangles, trapezoid, rhombus, parallelogram, square, rectangle, hexagon, octagon, and pentagon. The cards with perimeter feature straight-forward adding sides as well as questions about missing sid