Triangle Angle Sum & Exterior Angle Theorems

Jill Casey, Carolee Armour, 08/apr/2020

Triangle Angle Sum Theorem


  • 1. Triangle Angle Sum: Exploring Angles
  • 2. Triangle Angle Sum: Proof by Transformation
  • 3. Triangle Angle Sum: Angle Measurements
  • 4. Exterior Angle Theorem

1.

Triangle Angle Sum: Exploring Angles

[color=#000000]Interact with the applet below for a few minutes.  [br]Then, answer the questions that follow.  [br][br][/color][i][color=#980000]Be sure to change the locations of the triangle's WHITE VERTICES each time before you drag the slider!!! [/color][/i]
Triangle Angle Sum Theorem
From your observations, what is the sum of the measures of the interior angles of [i]any triangle?  [/i]
Sum of the Exterior angles of a triangle
[color=#000000]From your observations, what is the sum of the measures of the exterior angles of [i]any triangle?  [/i][/color]
– Carolee Armour, Jill Casey, Tim Brzezinski

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