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.
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line
It is a point where one line (straight or curved) meets another line or a non-coplanar surface.
A Line.
The line of reflection is the perpendicular bisector of any point and its image.
A tangent