Sometimes one knows more about angles than about sides. Young mathematicians learn about the AAS and ASA triangle congruence criteria by watching an informative video. They use these shortcuts to demonstrate triangle congruence in written proofs and also see why SSA is not a viable congruence criterion.

Concepts

congruence, triangles, congruent triangles, geometric proofs, angle angle side theorem

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Instructional Ideas

• Assign the corrective assignment as homework or as extra credit

Classroom Considerations

• This is the third of five lessons in the Geometry - Triangle Congruence unit
• Scholars must be familiar with two-column proofs
  

• This video is hosted on YouTube

Pros

• Includes a printable worksheet
• Instructors will appreciate the separate answer key
  

Cons

• None

Common Core

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