Triangle Interior + Exterior Angles

INSTRUCTIONS:
Move the sides of the triangle to create different angles, what do yo notice about the image? What changes? What stays the same?
Interact with this app for a few minutes. LARGE POINTS are moveable.
[color=#000000]What can we conclude about the measure of an exterior angle when we compare it to the opposite interior angles?[/color]
How can we mathematically express this?
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Information: Triangle Interior + Exterior Angles