"I have... Who has...?" is a great game to play with your class. My students had a blast with this and really reinforced their knowledge of geometry. They also get to practice their listening skills which is a pretty big deal for some students. This activity is incredibly engaging for them.
This particular version of the game is to practice naming and describing the properties of 2D figures, symmetry, congruency, and transformations. Check out my others for more geometry topics.