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Each exterior angle: 40 degrees Each interior angle: 140 degrees
Providing that it is a regular octagon each exterior angle measures 45 degrees.
Each exterior angle measures 8 degrees
An exterior angle of a regular polygon and its corresponding interior angle = 180° If an exterior angle is 1/8 of the interior angle (A) then A + A/8 = 180 : 9A = 1440 : A = 160 Each exterior angle is thus 180 -160 = 20° The number of sides = 360 ÷ exterior angle = 360 ÷ 20 = 18
20.