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Chapter 17 Lines, Rays, and Angles
lines, rays, and angles
16
Mathematics
02/07/2013

Term
 Point
Definition
 an exact location on a line, in a plane, or in space
Term
 Line
Definition
 a straight path of points that continues without end in both directions
Term
 Line Segment
Definition
 part of a line that has 2 endpoints and all the points in between them
Term
 Ray
Definition
 part of a line that has 1 endpoint and continues in all directions
Term
 Plane
Definition
 a flat surface of points that continues without end in all directions
Term
 Angle
Definition
 2 rays with the same endpoint
Term
 Vertex
Definition
 the point at which 2 rays meet to form an angle
Term
 Protractor
Definition
 a tool for measuring the size of an angle
Term
 Degree
Definition
 the unit used for measuring an angle
Term
 Right Angle
Definition
 an angle that measures 90 degrees
Term
 Acute Angle
Definition
 an angle that measures < 90 degrees
Term
 Obtuse Angle
Definition
 an angle that measures > 90 degrees but < 180 degrees
Term
 Straight Angle
Definition
 an angle that measures exactly 180 degrees
Term
 Intersecting Lines
Definition
 lines that cross each other to form 4 angles
Term
 Parallel Lines
Definition
 lines in a plane that never intersect and are always equal distance apart (train tracts)
Term
 Perpendicular Lines
Definition
 lines that intersect to form 4 RIGHT angles
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