Exterior Angles Theorems: Lesson

This Exterior Angles Theorems: Lesson video also includes:

Use the inside to find the outside. The resource presents two theorems dealing with exterior angles of a triangle. Using the two theorems, the segment from a larger geometry playlist works problems to solve for angle measures.

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CCSS: Adaptable
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Instructional Ideas
  • Have individuals describe an informal proof of the two exterior angle theorems
Classroom Considerations
  • Individuals should know the Triangle Angle Sum Theorem
  • The class should know how to solve linear equations
  • Uses colors to highlight different sets of angles
  • Links to other CK-12 resource on exterior angles
  • None
Common Core