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The total number of interior degrees in a polygon with number of sides n is 180 times (n-2).

For a regular octagon (meaning all sides are the same, thus all angles are the same) you would divide 180(8-2) by 8 to get 135.

For a non-regular octagon, you would add up all the angles to get 180(8-2) or 1080. If one of the angles is missing, sum all the other sides and subtract that sum from 1080 to get the answer.

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14y ago

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