Acute angle - An angle that is less than 90º, Obtuse angle - An angle that greater than 90º and less than 180º, Straight angle - 180º angle, Right angle - 90º angle, Supplementary angles - Two angles that add to 180º, Complementary angles - Two angles that add to 90º, Vertical angles - Pair of angles with equal measure that lie on opposite sides of two intersecting lines, Adjacent angles - Two angles that have a common side and vertex, Parallel lines - Lines that are the same distance apart, Perpendicular lines - Lines that intersect at a right angle, Intersecting lines - Lines that meet at exactly one point,

Angles and Angle Relationships

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