Lesson Plan: Exterior Angles of a Triangle Mathematics • 8th Grade

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to find the measure of the exterior angle of a triangle and compare between an exterior angle and its corresponding remote interior angles.


Students will be able to

  • know the definition of an exterior angle of a triangle,
  • know the definition of an interior angle of a triangle,
  • know that the exterior angles of a triangle sum to 360,
  • solve problems involving exterior and interior angles of triangles.


Students should already be familiar with

  • the angle sum of a triangle.


Students will not cover

  • trigonometry.

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