This activity is great for students as they learn the difference between Right, Acute, and Obtuse angles. It can also be adapted depending on the level of your students. There are two guide sheets for each angle, one with the definition of the angle, for kids who are struggling, and one without the definition. There are eight category cards to match the angle cards to. Once you are finished with the angle sort, the cards can also be used to play the memory game to match up the pairs.