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Geometry in Motion · Term 2

Exterior Angle Theorem

Understanding and applying the Exterior Angle Theorem to find unknown angle measures in triangles.

Key Questions

  1. Explain the relationship between an exterior angle and the two non-adjacent interior angles of a triangle.
  2. Construct a proof for the Exterior Angle Theorem using properties of parallel lines.
  3. Predict unknown angle measures in complex diagrams involving the Exterior Angle Theorem.

Ontario Curriculum Expectations

8.G.A.5
Grade: Grade 8
Subject: Mathematics
Unit: Geometry in Motion
Period: Term 2

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