90 degrees.
A rectangle is a four-sided figure with two pairs of parallel sides and four right angles.
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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.
Four inside angles, all of them being right angles (90 degrees) in each corner. You could also count the four outside angles, outside each corner, each one being 270 degrees. (Adding one inside angle with its outside angle = 360 degrees (a circle)
360/45 = 8 so the polygon has 8 sides.
Each exterior angle = 630/6 = 60 degrees. So each interior angle = 180 - 60 = 120 degrees.