All of the angles are 90o.
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((4 x 360) - 360) = 3 x 360 = 1080o so if it's regular, eg a rectangle, each angle is 270o
90 degrees
140 degrees
It is a regular 8 sided octagon
Square, or a rectangle. * * * * * Since it is a REGULAR polygon, it cannot be a rectangle. So the only answer is a square.