Perpendicular Lines - Lines that intersect (cross) to form at least one right angles, Intersecting Lines - Lines that cross but do not form a right angle, Acute Angle - An angle with a measure greater than 0° and less than 90°, Degree - A unit of measure for an angle.  1/360 of a circle, Ray - A figure represented by two rays or line segments that have a common endpoint., Line Segment - A part of a line. This has two endpoints, Obtuse Angle - An angle with a measure greater than 90º and less than 180°, Parallel Lines - Two or more lines that lie in the same plane and do not intersect., Point - An exact location. It is indicated with a single dot, Right Angle - An angle that measures exactly 90º, Vertex - The point at which the rays that form the angle intersect,

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