Each interior angle of an octagon has an angle of 135 degrees.
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The sum of the interior angles of an octagon is equal to 1080 degrees.
135 degrees * * * * * But only if it is a REGULAR octagon. And there is no reason why that should be the case.
The 8 interior angles of an octagon add up to 1080 degrees The 8 exterior angles of an octagon add up to 360 degrees
The sum of the interior angles of an octagon is (8-2)*180 = 1080 degrees.
The exterior angles of an octagon total 360 degrees.