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This The Definition of Sine, Cosine, and Tangent lesson plan also includes:
- Similarity, Proof, and Trigonometry - Module Overview (PDF)
- Similarity, Proof, and Trigonometry - Module Overview (Doc)
- The Definition of Sine, Cosine, and Tangent (Doc)
- The Definition of Sine, Cosine, and Tangent (PDF)
- The Definition of Sine, Cosine, and Tangent (Doc)
- Assessment
- Answer Key
- Join to access all included materials
Introduce your classes to a new world of mathematics. Pupils learn to call trigonometric ratios by their given names: sine, cosine, and tangent. They find ratios and use known ratios to discover missing sides of similar triangles.
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CCSS:
Designed
Concepts
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Instructional Ideas
- Compare the trigonometric ratios of special right triangles with the known patterns; help learners to see that they can apply this concept to all right triangles
- Form collaborative groups to complete the exit ticket and possibly the practice problems
Classroom Considerations
- Pupils should already have a basic understanding of side ratios in right triangles
- Builds from the previous lesson in the 36 part series
Pros
- Lesson does not require a calculator as the focus is on similarity and equivalent ratios
- The well-designed lesson leads students through the process of applying trigonometric ratios to similar triangles
- Makes a connection to the sine and cosine of complementary angles
Cons
- There are inconsistencies in simplifying radicals; sometimes the denominator is rationalized and other times it is not