The Third Angle Theorem: Lesson

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If two sets of angles are equal, the third set is too. An informative portion of a playlist on geometry develops the Third Angle Theorem for triangles. Using the theorem, the presenter shows how to determine the measure of missing angles in triangles.

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CCSS: Adaptable
Instructional Ideas

  • Provide opportunities for class members to use the theorem to find angle measures
Classroom Considerations

  • Individuals should know the Angle Sum Theorem
  • Assumes the class can solve linear equations in one variable

  • Links to more resources on the Third Angle Theorem
  • Contains worked examples to help with understanding

  • None
Common Core