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 Related Terms
 Line:  One of the basic undefined terms of geometry. A line has no thickness but its length goes on forever in two directions.
Length: The distance between two ends of a line segment.
Horizontal Line: A line that goes left and right.
Vertical Line: A line that goes up and down.
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.