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This Using Trigonometry to Find Side Lengths of an Acute Triangle lesson plan also includes:
- Similarity, Proof, and Trigonometry - Module Overview (PDF)
- Similarity, Proof, and Trigonometry - Module Overview (Doc)
- Using Trigonometry to Find Side Lengths of an Acute Triangle (Doc)
- Using Trigonometry to Find Side Lengths of an Acute Triangle (PDF)
- Using Trigonometry to Find Side Lengths of an Acute Triangle (Doc)
- Assessment
- Answer Key
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Not all triangles are right! Pupils learn to tackle non-right triangles using the Law of Sines and Law of Cosines. After using the two laws, they then apply them to word problems.
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CCSS:
Designed
Concepts
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Instructional Ideas
- Use a graphic organizer to record important information and examples
- For more advanced learners, challenge them to prove the Law of Sines or Cosines; give them a first step and allow them to work from there
Classroom Considerations
- Pupils may have a hard time understanding formulas, so you can supplement some simple problems until they are comfortable with how the formula works
- Designed for one class period, but it may need to be extended depending on the level of the class
- The lesson continues from installment 32 in the 36-part series
Pros
- Resource spends time developing the formulas instead of just providing the them to pupils
- Provides scaffolding suggestions to allow for differentiation within classes
Cons
- None