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A polygon is a 2-dimensional shape with 3 or more sidesa closed plane figure with three or more sides that are straight
It is any plane shape which is enclosed by 12 straight sides.
It means a plane geometric shape bounded by 12 straight lines.
A parallelogram is a plane, or two-dimensional shape that is bounded by four straight lines which form its sides. Each pair of opposite sides consists of parallel and congruent (same length) lines.
It is a two-dimensional (plane) shape bounded by four straight sides with equal length but which does not have an interior angle of 90 degrees. Other properties, like parallel sides, equal opposite angles, bisecting diagonals etc all follow from these.