A "line" does.
A "line segment" does not.
Most people interpret "line" to mean "line segment" (without realising it) and so would conclude that a line does not go on forever.
A "line segment" is a line between two points, which is what you would draw if told to draw a "line" on a piece of paper.
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Yes, you are right. A line segment eventually ends. In fact, a segment has two endpoints. But parallel lines go on forever; they have no endpoints.Example: (arrows indicating they go on forever)_____________________ (these are parallel line segments)
No. Line segments end at the endpoints.
No, But 1 Dimensional Does. The lines may or may not go on forever but that has no effect on whether or not a parallel line will cross.
yes
lines go forever in both directions rays start at a specific point and go forever in only one direction