This article is written for middle school students to learn about triangle similarity using the angle-angle criterion. It is brief (one page), but will give your students a thorough explanation of this concept. This can be used in station rotations or with a whole class. I have included directions and activity sheets for a partner reading activity and small group summarizing.
This article was written by Kimberly Wasylyk, a math teacher with 10 years of experience.
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Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angle-angle criterion for similarity of triangles. For example, arrange three copies of the same triangle so that the sum of the three angles appears to form a line, and give an argument in terms of transversals why this is so.
Common Core Math Article - Angle-Angle Simility
by Kimberly Wasylyk
is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License