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 Related Terms
 Ray:  A ray begins at a point and goes on forever in one direction.
Angle: Region between two rays or the amount of rotation about a fixed point.
Line: One of the basic undefined terms of geometry. A line has no thickness but its length goes on forever in two directions.
Segment: The part of a line between two points on the line. Sometimes referred to as a line segment.
Line Segment: The part of a line between two points on the line. Sometimes referred to as a segment.
Point: One of the basic undefined terms of geometry. A point has no length, width, or thickness, and we often use a dot to represent it.