This activity has 16 cards including diagrams, perimeter, area formula, and area of two-dimensional figures. The two-dimensional figures include a triangle, parallelogram, trapezoid, and rhombus. Students will sort the cards according to which two-dimensional figure they belong to. This is a great activity for groups of 2-4 and can be laminated so that you can use it year after year. You could also have students glue it into their interactive notebooks.
to check out my Math Card Sort Activity Bundle. It includes this resource and many other card sort activities in one bundle for a great price!