Definition:Line/Infinite Half-Line

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This page is about ray in the context of geometry. For other uses, see ray.


An infinite half-line is a line which terminates at an endpoint at one end, but has no such endpoint at the other.

Start Point

The endpoint of an infinite half-line is a known as its start point.

Also known as

Another term for an infinite half-line is a ray.

Some sources merely refer to it as a half-line, its infinitude being taken for granted.

Some sources do not hyphenate, and use the term half line.

Also see

  • Results about infinite half-lines can be found here.