Triangle Area: No Height? Use the Sine

No height? No problem! Learners use their knowledge and a little help from GeoGebra to develop the Law of Sines formula. The Law of Sines helps to determine the height of triangles to calculate the area.

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CCSS: Designed
Instructional Ideas

  • After completing the activity, ask individuals to explain to a partner the proof of the Law of Sines
Classroom Considerations

  • Ensure a familiarity with calculating the area of a triangle and trigonometric ratios
  • Requires individual laptops with Internet to access GeoGebra
Pros

  • Includes both a warm-up and closing exercise
  • Allows pupils to experiment with different strategies to discover the formula
Cons

  • None
Common Core