Law of Cosines—Law of Sines and Law of Cosines

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

New Review

Laws are not always made to be broken! Scholars learn how following the Law of Cosines can help to find unknown measures. They first derive the formula and then apply it to triangles. The activity concludes the two-part series from Illuminations.

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CCSS: Adaptable
Instructional Ideas

  • Review the Law of Sines prior to introducing the activity
  • Ask groups to create a poster highlighting the derivation of the Law of Sines and Cosines as an assessment
Classroom Considerations

  • Expects a proficiency with the Pythagorean Theorem
Pros

  • Includes a step-by-step activity handout for pupils to follow
  • Provides a link to additional resources
Cons

  • None
Common Core