A Line doesn't have a definite Length and doesn't have any end points.
For example :- below Figure shows a Line. Since it doesn't have any end points,
so there are arrows on the end points.
A line segment has a definite Length and has 2 end points.
For example :- below Figure shows a Line segment having two end points A and B.
A Ray doesn't have a definite Length, but it have one point.
For example :- below Figure shows a Ray, having one end points i.e A and other end with Arrows.
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