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Law of Sines and Cosines Worksheet (pdf)

Objective

Students will practice deciding when to apply the law of cosines vs the law of sines to calculate the side length of a triangle and to calculate the measure of an angle. The second part of the sheet focuses on problems that require using the formulas more than once (law of cosines to get side, then law of sides to get angle etc..) (more here)

Example Questions

Law of Sines and Cosines Picture Law of Sines and Cosines picture Law of Sines and Cosines picture
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Visual Aids

Picture of the law of cosines formula Law of Sines Formula

Other Details

This is a 5 part worksheet:

  • Part I Model Problems
  • Part II Determining Which Formula to Use
  • Part III Mixed Problems on Law of Sines and Law of Cosines
  • Part IV Challenge Questions
  • Part V Answer Key
Download this web page as a pdf with answer key

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