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This is a great, engaging activity for students to practice factoring quadratics.
The quadratics in this activity include factoring when a = 1, and factoring perfect squares.
Students can work individually or in groups. Cut out a set of triangles for each group (I’ve laminated mine so I can use them again and again). On some sides of the triangles there are quadratics, and on other sides, the factored forms. The task for each group is to match up all the problems on the triangles with the answer sides. There are some answers that won’t be used, that will appear on the outside. Each triangle is labeled with a letter to make it easier to check. An answer key is provided on the last page.