Cosine Rule – Missing Sides

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Not a right triangle, not a problem. Pupils learn about the cosine rule, or the law of cosines, to solve for missing side measures in triangles. They accomplish this task by watching a short video, which covers two examples.

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Instructional Ideas

  • Use the video with learners having trouble with the concept
Classroom Considerations

  • Knowledge of bearing is beneficial
  • Scholars should be familiar with using their calculators to evaluate cosine
Pros

  • Explains and shows each step in the solution process
Cons

  • Does not address finding angles