Why use six corresponding parts when three will suffice? The second of five lessons in the Geometry - Triangle Congruence unit focuses on the SSS and SAS triangle congruence criteria. By watching a video, scholars learn how to identify when SSS and SAS apply and how to use them in congruence proofs. They also see why AAA does not prove congruence.

Concepts

congruence, triangles, congruent triangles, geometric proofs

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Instructional Ideas

• Use the resource with pupils struggling with the SSS or SAS congruence theorems
  

Classroom Considerations

• Learners should be familiar with triangle congruence from the previous lesson
• Prior experience with two-column proofs is necessary
  
• Note that the video does not cover congruence in terms of rigid motions
  

• This video is hosted on YouTube

Pros

• Worksheets include the examples from the video to help individuals take notes
  
• Provides a corrective assignment for additional practice
  

Cons

• None

Common Core

HSG-CO.B.8 HSG-CO.C.10