Lesson Plan

Solving Problems Using Sine and Cosine

Curated and Reviewed by Lesson Planet

Concepts are only valuable if they are applicable. An informative resource uses concepts developed in lessons 26 and 27 in a 36-part series. Scholars write equations and solve for missing side lengths for given right triangles. When given a non-right triangle, pupils must develop a plan to find the missing length. 

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CCSS: Designed
Additional Tags
Instructional Ideas
  • Require learners to draw a triangle for each example and write an equation before finding a solution
  • Create collaborative groups to tackle the opening activity, and have them explain their strategies
Classroom Considerations
  • Pupils should be comfortable solving similar equations; review may be necessary depending on ability or experiences
Pros
  • Non-examples are used to ensure high schoolers understand that the Pythagorean Theorem and trigonometric ratios apply only to right triangles
  • Includes a teacher guide with detailed explanations and suggestions for scaffolding
Cons
  • None