Octagon Angle Theorems

[color=#000000]Interact with the app below for a few minutes.  [br]Then, answer the questions that follow.  [br][br]Be sure to change the locations of this octagon's vertices each time [i]before[/i] you drag the slider![/color]
[b]Determine the sum of the measures of the interior angles of this octagon[/b].
What is the [b]sum of the measures of the exterior angles [/b]of this octagon?
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Information: Octagon Angle Theorems