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a pair of a non-adjacent angles formed by two intersecting lines a pair of a non-adjacent angles formed by two intersecting lines A pair of adjacent angles whose sum is 180º A pair of adjacent angles whose sum is 180º a pair of angles whose sum is 90º a pair of angles whose sum of 180º a pair of angles whose sum is 90º a pair of angles whose sum of 180º a quadrilateral with 2 distinct pairs of consecutive congruent sides a quadrilateral with 2 distinct pairs of consecutive congruent sides a quadrilateral with 2 pairs of parallel sides a quadrilateral with 2 pairs of parallel sides a quadrilateral with exactly one pair of parallel sides a quadrilateral with exactly one pair of parallel sides a triangle that has 3 acute angles a triangle that has 3 acute angles a triangle that has one 90º angle a triangle that has one 90º angle a triangle that has one obtuse angle a triangle with 3 congruent sides a triangle with at least 2 congruent sides a triangle with no congruent sides an angle that measure 180º a triangle that has one obtuse angle a triangle with 3 congruent sides a triangle with at least 2 congruent sides a triangle with no congruent sides an angle that measure 180º an angle that measures 90º an angle that measures 90º an angle that measures less than 90º an angle that measures less than 90º An angle that measures more than 90º but less than 180º An angle that measures more than 90º but less than 180º an equiangular parallelogram an equiangular parallelogram an equilateral parallelogram an equilateral parallelogram an equilateral rectangle, an equilateral rectangle, an equiangular rhombus, an equiangular rhombus, or a regular quadrilateral or a regular quadrilateral