Geometry Lesson 9

Chelsea Antosh, Oct 6, 2017


  • 1. Triangle Exterior Angle-Sum Theorem
  • 2. Triangle Exterior Angle Sum Theorem v2
  • 3. Sum of the Angles in a Triangle

1.

Triangle Exterior Angle-Sum Theorem

Move the sliders.[br]What do you notice about the exterior angle and the remote interior angles[br](the two angles [i]not[/i] adjacent to the exterior angle)?[br][br]Move the sliders back and drag the vertices to change the shape of the triangle to see if it always works.[br][br]What can you say about the sum of the two remote interior angles compared to the exterior angle?
– Mr. Coffie, GreenMaths

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