Congruence Criteria for Triangles—SAS

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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CCSS: Designed
Additional Tags
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
  • Provides a visual approach to determining congruence 
  • Includes detailed teacher guide to aid in instruction
  • None
Common Core