Topic: Triangle congruence criteria and proofs (G-CO.B.8, G-SRT.B.5). Adjust the settings, then copy the prompt.
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Planning notes for this lesson
Prerequisite skills to check: angle relationships, including vertical angles and angles formed by parallel lines and a transversal (8.G.A.5); rigid motions (8.G.A.1-2); properties of equality and the reflexive property.
Key vocabulary: congruent, corresponding parts, included angle, included side, SSS, SAS, ASA, AAS, CPCTC.
Warm-up idea: Give each pair of students three strips of fixed lengths and ask whether anyone can build a triangle different from their neighbor's.
Exit ticket idea: Students name the criterion that proves two marked triangles congruent and write a short proof with a reason for each step.
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