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opposite rays rays that have the same endpoint and their union is a straight angle linear pair two angles that share the same side vertical angles two angles that when the opposite rays of the sides of one angle are the sides of the other angle exterior angles angles that are outside the other two lines interior angles angles that are between the other two lines alternative exterior angles exterior angles that are on opposite sides of the transversal alternative interior angles interior angles that are on opposite sides of the transversal same-side exterior angles exterior angles on the same side of the transversal same-side interior angles interior angles on the same side of the transversal corresponding angles angles that are in the same relative position in the intersections What are the three properties of a parallelogram? Consecutive angles of a parallelogram are supplementary; opposite angles of a parallelogram have the same measure; opposite sides of a parallelogram have the same length how many pairs of opposite angles are there on a quadrilateral? 2 how many pairs of opposite sides are there on a quadrilateral? 2 consecutive angles two angles whose vertices are the endpoints of the same side consecutive sides two sides with a common endpoint congruent figures figures with the same size and shape