A ray does have a definite beginning, it's point, but it goes on forever in the other direction, which is symbolized by an arrow.
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A terminating decimal.
line segments have two definite points, A and B, a ray has has only one definite point and the over indefinite point is a continuous line
A ray has a beginning but no endpoint.
The endpoint.
No A line segment has a beginning and an end, but a line has no beginning or end. A ray has a beginning but no end.