This is all a matter of labels ... what certain words mean.
-- "Line" means it has no ends, and goes on forever in both directions.
-- "Ray" means it has one end. It goes on forever in one direction.
-- "Line segment" means it has two ends, and a definite length.
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a line a ray goes in only one direction forever No, a line goes on forever in two directions, a ray starts at one point and then goes on forever.
It's called a Ray.
- A line has no ends and extends forever in both directions.- A ray has one end and extends forever in the other direction.- A line segment has two ends and a definite length.
a straight line that extends for a point forever in one direction
ray is a line segment that extends forever in one direction