a line has a dot on each end and a ray only has one dot and an arrow, it keeps on going.
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a ray in maths is a arm of an angle.
A line extends infinitely in both directions, a ray in only one. A ray can be shown by drawing a small arrow above the name of the ray, with the arrow pointing in the direction of the ray.
A ray has a single start point, and goes on infinitely in one direction. A line segment has two end points and is finite. A line has no end points and goes on infinitely in two directions.
line: it goes on for infinity. <---------> line segment: has 2 endpoints, does not continue. -------- ray: starts at one point, then goes on for infinity. --------->
A ray looks like this: •----------------> One end point, and an endless line going the other way.