The terminator is the [moving] line on earth where day turns into night (and conversely).
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A line at right angles to another line.
Yes, I do understand the definition of a line segment. A line segment is a line that actually has two endpoints. Such endpoint is a triangle's or a square's side.
it is a line that is not visible but it is there it is like air
Line segments are congruent if they have the same length
The definition is any chart where one or more points lie off the straight line joining the other points.