Congruence Criteria for Triangles—ASA and SSS

How do you know if a pair of triangles are congruent? Use the lesson to help class members become comfortable identifying the congruence criteria. They begin with an exploration of ASA and SSS criteria through transformations and SAS before recognizing the criteria in different figures and before completing formal proofs.

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CCSS: Designed
Instructional Ideas

  • Use a graphic organizer to record different examples of ASA, SSS, and SAS criteria
  • Ask pupils to create examples for a partner to analyze
Classroom Considerations

  • Learners must have a strong understanding of the SAS criteria of congruence, transformations, and isosceles triangles
Pros

  • Uses a logical progression of examples 
  • Detailed notes are provided to aid in instruction
Cons

  • None
Common Core