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This Congruence Criteria for Triangles—SAS lesson plan also includes:
- Congruence, Proof, and Constructions - Module Overview (PDF)
- Congruence, Proof, and Constructions - Module Overview (Doc)
- Congruence Criteria for Triangles—SAS (Doc)
- Congruence Criteria for Triangles—SAS (PDF)
- Congruence Criteria for Triangles—SAS (Doc)
- Assessment
- Answer Key
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Looking for a different approach to triangle congruence criteria? Employ transformations to determine congruent triangles. Learners list the transformations required to map one triangle to the next. They learn to identify congruence if rigid transformations can be identified, which leads to formal proofs using the SAS theorem.
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Instructional Ideas
- Use problem set questions for board work to frequently check for understanding
- Have peers critique each other's work and provide feedback before grading assigned work
Classroom Considerations
- Learners should have prior experience with two-column proofs and general properties
Pros
- Provides a visual approach to determining congruence
- Includes detailed teacher guide to aid in instruction
Cons
- None