Law of Sines—Law of Sines and Law of Cosines

This Law of Sines—Law of Sines and Law of Cosines lesson plan also includes:

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It's important to abide by the law. A thought-provoking lesson helps learners derive the Law of Sines. They then apply the Law of Sines to find unknown measures. 

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CCSS: Adaptable
Instructional Ideas

  • Review triangle vocabulary as well as triangle congruence criteria prior to the activity
  • Following the activity, ask individuals to explain how to derive the law of sines as an exit ticket
Classroom Considerations

  • Requires a strong understanding of right triangle trigonometry
  • The first of a two-part Illuminations lesson series
Pros

  • Highlights the origin of the Law of Sines prior to application
  • Includes a detailed teacher guide to aid in planning
Cons

  • None
Common Core