Lesson Plan

Law of Sines

Curated and Reviewed by Lesson Planet

Prove the Law of Sines two ways. The ninth segment in a series of 16 introduces the Law of Sines to help the class find lengths of sides in oblique triangles. Pupils develop a proof of the Law of Sines by drawing an altitude and a second proof using properties of circumscribed circles.

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CCSS: Designed
Additional Tags
Instructional Ideas
  • Lead a discussion on what students need to determine a missing side in a triangle
Classroom Considerations
  • Pupils should know congruence theorems
  • The class should be familiar with the trigonometric ratios
Pros
  • The figures use colors to highlight the different triangles formed
  • The scaffolding suggests ways to assist those that struggle
Cons
  • None
Common Core