Give your students hands-on practice in classifying triangles with this cut and glue geometry activity. Students cut out a variety of triangles and glue them into a graphic organizer, classifying each triangle for both sides and angles. A key is included, and a bonus box provides an opportunity for critical thinking and writing across the curriculum as students explain why an equilateral triangle must be an acute triangle.

This PDF file includes four pages: a worksheet for sorting the triangles; a page with triangles to cut and glue to the worksheet; an answer key for the worksheet; and a page giving an answer for the bonus box.

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Please do not copy this activity for an entire grade level or school. If your colleagues like the activity, please send them to Teachers Pay Teachers!

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Anna Colley
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Classifying Triangles sorting activity by Anna M. Colley is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States License.