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quadrilateral with parallel opposite sides
facts about parallelograms
opposite angles are equal
parallelograms with right angles
all sides are equal
quadrilateral with one pair of parallel sides
A quadrilateral with two distinct pairs of equal adjacent sides.
polygons: sum of all interior angles
polygons: sum of all exterior angles
(n*(n-3)/2 where n>=3
polygons: number of diagonals is