Triangle's Interior Angles

This Triangle's Interior Angles lesson plan also includes:

Given a pair of parallel lines and a triangle in between, geometers prove that the sum of the interior angles is 180 degrees. This quick quest can be used as a pop quiz or exit ticket for your geometry class.

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CCSS: Designed
Additional Tags


  • Meets Common Core State Standards for eighth grade geometry
  • Detailed teacher commentary explains the solution 

  • None
Common Core