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An interior or exterior angle of the polygon.
An "opposite side" depends on the shape that you have got. For a polygon with an even number of sides, (say 2n), the side which is opposite a given side is one that is nth from that side. In such a polygon a vertex does not have an opposite side. For a polygon with an odd number of sides, (say 2n+1), the side which is opposite a given vertex is one that is (n+1)th from that vertex. In such a polygon a side does not have an opposite side.
A line?? It's impossible to have a polygon with only one side, hence the "poly" meaning many.
A regular polygon has all its angles equal AND all its sides equal. A nonregular polygon has at least one angle or one side that is different from the others.
well, for one thing, what polygon is it. a triangle, a quadrilateral, what!? Two, if its only side is 8in., then it is not a polygon at all. it needs to be a closed plane of connecting lines.