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 Related Terms
 One-Dimensional Figure:  Figures that have only length (no width or thickness).
Line: One of the basic undefined terms of geometry. A line has no thickness but its length goes on forever in two directions.
Line Segment: The part of a line between two points on the line. Sometimes referred to as a segment.
Ray: A ray begins at a point and goes on forever in one direction.
Two-Dimensional Figure: Figures that have length and width (no thickness).
Three-Dimensional Figure: Figures that have length, width, and thickness.