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This Sine and Cosine of Complementary Angles and Special Angles lesson plan also includes:
- Similarity, Proof, and Trigonometry - Module Overview (PDF)
- Similarity, Proof, and Trigonometry - Module Overview (Doc)
- Sine and Cosine of Complementary Angles and Special Angles (Doc)
- Sine and Cosine of Complementary Angles and Special Angles (PDF)
- Sine and Cosine of Complementary Angles and Special Angles (Doc)
- Assessment
- Answer Key
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Building trigonometric basics here will last a mathematical lifetime. Learners expand on the previous lesson in a 36-part series by examining relationships between the sine and cosine of complementary angles. They also review the ratios of the special angles and learn patterns to help remember these ratios.
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CCSS:
Designed
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Instructional Ideas
- Use an applet or create a geogebra demonstration to illustrate example #2
- Create a set of 30-60-90 triangles with known side length; the ratios of sides should become known values
Classroom Considerations
- Some of the symbols may be confusing for pupils; substitute actual values for angles and/or side lengths
Pros
- Emphasizes the ratios for 30-, 60-, 45-, and 90-degree angles
- Includes a teacher guide with suggestions for differentiation
Cons
- None