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Exploration 3: Exterior Angle of a Triangle

Author:Yoobin, Tim Brzezinski

Exploration 3

There is a triangle with 3 large white vertices (points) that can be moved around.
  • An exterior angle of a triangle is shown.
  • The 2 colored angles are referred to as its remote interior angles.
 Interact with the triangle, and use the "Slide Me!" tab to see what happens to the remote interior angles of the triangle. Then, answer the question at the bottom.

Question 1

What do you notice about the SUM of the measures of the pink angle and green angle (the 2 remote interior angles) of a triangle?

Question 2

How does this relate to the fact we observed in Exploration 1? Make a connection and explain.

Drawing Task

Find the fact that this exploration helps us visualize, and draw a visual on your UNIT 1 Fact Sheet B.

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