naming a line is different from naming a ray. say for example ,if we have line AB,this is similar to line BA while ray AB is different from ray BA.
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When naming a ray the endpoint is written first.
There is no intrinsic difference. Either can be named using the names of any two points on them, or using any letter or symbol of any alphabet - including symbols that you have made up.
a line is a ray cause of the angles in directery in the proportion in the radius....
In geometry, a line is somply a collection of points. However, when naming a line, a line is nemed using two of its points.
Because the line goes on forever in both directions.