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This Base Angles of Isosceles Triangles lesson plan also includes:
- Congruence, Proof, and Constructions - Module Overview (PDF)
- Congruence, Proof, and Constructions - Module Overview (Doc)
- Base Angles of Isosceles Triangles (Doc)
- Base Angles of Isosceles Triangles (PDF)
- Base Angles of Isosceles Triangles (Doc)
- Assessment
- Answer Key
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Build confidence in proofs by proving a known property. Pupils explore two approaches to proving base angles of isosceles triangles are congruent: transformations and SAS. They then apply their understanding of the proof to more complex ones involving isosceles triangles.
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CCSS:
Designed
Concepts
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Instructional Ideas
- Create envelop proofs from the examples for students to complete before attempting the proof independently
- Form collaborative groups and differentiate by assigning the example proofs to different groups
Classroom Considerations
- Prior knowledge of SAS, geometric proofs, and corresponding parts is helpful
Pros
- The resource introduces proofs gradually based on their complexity, from beginner to increasingly more difficult
- Multiple methods are encouraged
Cons
- None