Sine or Cosine Rule?

Explore triangle problems that require the Law of Sine or Law of Cosine. A straightforward lesson focuses on deciding when to use each law. The instructor presents several triangles for pupils to consider and describes patterns in the triangles.

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CCSS: Adaptable
Instructional Ideas

  • Flip your classroom by assigning the video as homework and using class time for practice
  • Follow the video with practice problems requiring both the Law of Sine and Law of Cosine
Classroom Considerations

  • Expects pupils already know the Law of Sines

  • Provides thorough explanations and tips for remembering information
  • Uses visuals to reinforce the content

  • None