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supplementary sum equal to 180 degrees parallelogram polygon with both pairs of opposite sides parallel line a series of points that extend in opposite directions without end polygon closed plane figure with at least three sides alternate interior angles lie on opposite side of transversal transversal line that intersects two other lines in different points skew lines do not lie in the same plane regular polygon all congruent sides and angles rectangle polygon with 4 90-degree angles parallel never intersect. point location in space ray a part of a line with one endpoint square polygon with 4 90-degree angles and 4 congruent sides rhombus polygon with 4 congruent sides plane a flat surface complementary sum equal to 90 degrees segment a part of a line with two endpoints congruent equal quadrilateral polygon with four sides trapezoid polygon with exactly one pair of parallel sides adjacent angles share a vertex and a side vertical angles formed by two intersecting lines, opposite each other corresponding angles lie on same side of transversal