parallel lines - two lines on a given plane that do not intersect, perpendicular lines - two intersecting lines that form 90-degree angles, complementary angles - two angles whose measures add up to 90 degrees, supplementary angles - two angles whose measures add up to 180 degrees, congruent angles - angles that have equal measure, vertical angles - non-adjacent angles formed by two intersecting lines; they are congruent linear pair of angles, adjacent angles - coplanar angles that share a common side and a common vertex, but no common interior point, linear pair of angles - Two adjacent angles whose non-common sides form a straight line,

Line Pairs and Angle Pairs

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