a ray is a line with one end point and the other side goes on forever. if it had two end points it would be a line segment
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Ray
A ray
A segment has 2 endpoints. A ray has only 1 endpoint, where the other end is an infinite line.
A line segment has two endpoints.
line: it goes on for infinity. <---------> line segment: has 2 endpoints, does not continue. -------- ray: starts at one point, then goes on for infinity. --------->