An 8 sided octagon has 8 interior angles that add up to 1080 degrees which can be proven by using a protractor
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You cannot - at least, not until you specify what aspect of the octagon you wish to measure: its perimeter, area, sides, apothem, etc.
An interior angle of a regular octagon is 45 degrees. The exterior angles measure 315 degrees.
135 Each interior angle of a regular octagon measures 135 degrees.
135 degrees
measure each edge and times it by eight.
An octagon has 8 angles. An octagon has the same number of angles as it does sides. Eight. All of the angles measure 135 degrees, and all the angles together are 1080 degrees.