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360 divided (180-n) This uses the exterior angle theorem and linear pair theorem. This works on regular polygons. All the angles congruent.
Yes.
No. All linear pair angles are supplementary, but supplementary angles do not have to be a linear pair.
All supplementary angles do not form a linear pair. The opposite angles of any quadrilateral inscribed in a circle (a cyclic quadrilateral) are supplementary but they are not a linear pair. However, all linear pair are supplementary.
No, angles that form a linear pair are supplementary.