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A line is related to a surface as a point to a plane. In geometry, a point has no dimensions and defines a location in space, while a plane is a two-dimensional surface that extends infinitely in all directions. Similarly, a line is a one-dimensional figure that extends infinitely in two opposite directions, while a surface is a two-dimensional figure that extends infinitely in all directions.
A Line
A ray starts at a point and extends forever in ONE direction. A line starts at a point and extends forever in TWO directions.
up and down it is the y axis on a graph
line