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Vocabulary SOL 6a Perpendicular Line A line that intersects another to create a 90° angle Vertical Angles Two angles that are formed when 111111111111111111111two lines intersect and are congruent. Adjacent Angles Share a vertex and a side. Transversal A line that intersects two or more other lines. Right Angles An angle that measures 90° Supplementary Angles The sum (added together) of the angles measure 180° Complementary Angles The sum (added together) of the angles measure 90° Corresponding Angles Angles that are on the same side of the transversal and are congruent when two lines are parallel. Alternate Interior Angles Angle pairs are on alternate sides of the Transversal, and they are on the interior of the two crossed lines a=d and c=b Parallel Lines Lines that will NEVER intersect in a plane. Acute Angles Have measurements less that 90° Obtuse Angles Have measurements more than 90° and less than 180°