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This Informal Proof of AA Criterion for Similarity lesson plan also includes:
- Informal Proof of AA Criterion for Similarity (Doc)
- Informal Proof of AA Criterion for Similarity (PDF)
- Informal Proof of AA Criterion for Similarity (Doc)
- Grade 8 Module 3: Teacher Materials
- Grade 8 Module 3: Student Materials
- Grade 8 Module 3: Copy Ready Materials
- Math Fluency Support for Grades 6-8
- Answer Key
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What does it take to show two triangles are similar? The 11th segment in a series of 16 introduces the AA Criterion for Similarity. A discussion provides an informal proof of the theorem. Exercises and problems require scholars to apply the theorem to justify whether two given triangles are similar.
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Designed
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Instructional Ideas
- Incorporate using geometry software to get more precise measurements
- Have individuals determine the transformations that would show their two drawn triangles are similar
Classroom Considerations
- Class members should be comfortable with the Fundamental Theorem of Similarity
Pros
- Some problems require more than AA to prove the similarity, they also require the Triangle Sum Theorem
- The answer key provides sample justifications
Cons
- None