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if you are talking about a regular octagon. or any polygon, Take the number of sides ( 8 for an Octagon) minus 2 and multiply by 180 for the total of all interior angles.

(8-2)180 = 1080

divide this by the 8 angles for the measure of each individual angle.

1080/8 = 135

By the way a "regular" polygon is one where all the sides and angles are the same.

Good luck.

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Q: How do you find the interior angles of a octagon?
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