What has only one endpoint and can be extended endlessly in the other direction?


A ray

Step by Step Explanation:
  1. A line segment which extends endlessly in one direction is called a ray.

  2. As an example, the figure above shows a ray AB. It has one endpoint A. This ray can be represented as ^@\overrightarrow{ AB }^@.
  3. We should remember that a ray does not have a definite length.

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