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This The Angle-Angle (AA) Criterion for Two Triangles to Be Similar lesson plan also includes:
- Similarity, Proof, and Trigonometry - Module Overview (PDF)
- Similarity, Proof, and Trigonometry - Module Overview (Doc)
- The Angle-Angle (AA) Criterion for Two Triangles to Be Similar (Doc)
- The Angle-Angle (AA) Criterion for Two Triangles to Be Similar (PDF)
- The Angle-Angle (AA) Criterion for Two Triangles to Be Similar (Doc)
- Assessment
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What do you need to prove triangles are similar? Learners answer this question through a construction exploration. Once they establish the criteria, they use the congruence and proportionality properties of similar objects to find missing sides.
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CCSS:
Designed
Concepts
Additional Tags
Instructional Ideas
- Incorporate modalities such as ang-legs for exploration in place of the constructions
- Provide non-examples of similar triangles to allow for comparison
Classroom Considerations
- Opening activity requires construction tools
- Pupils must be able to solve proportions; review as necessary
- The lesson continues from the first fourteen in a 36-part series
Pros
- Takes a hands-on approach to determine criterion for similar triangles
- Questioning encourages critical thinking
Cons
- None