Ray is part of a line that starts at one point and extends forever in one direction.
Explanation:
In geometry, a ray can be defined as a part of a line that has a fixed starting point but no end-point. It can extend infinitely in one direction. On its way to infinity, a ray may pass through more than one point. The vertex of the angles is the starting point of the rays.
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B. A part of a line with two endpoints?
line segment
A line segment has two endpoints. It contains these endpoints and all the points of the line between them. You can measure the length of a segment, but not of a line. A segment is named by its two endpoints, for example, ¯AB.
