135 degrees
* * * * *
But only if it is a REGULAR octagon. And there is no reason why that should be the case.
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If it is a regular 8 sided octagon then each exterior angle is 45 degrees and each interior angle is 135 degrees.
45 degrees.
Each interior angle of an octagon has an angle of 135 degrees.
45 degrees
1080 degrees total 135 degrees each angle