Question 833074
Since the sum of the exterior angles of any convex polygon is {{{360^o}}} ,
and there are {{{8}}} congruent exterior (and also interior) angles to a regular octagon,
each exterior angle measures {{{360^o/8=45^o}}} .
Since each interior angle is supplementary to the adjacent exterior angle,
each interior angle measures {{{180^o-45^o=highlight(135^o)}}} ,