Solving Problems Using Sine and Cosine

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
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

  • 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

  • None