• Ray (geometry), half of a line proceeding from an initial point
A ray can be thought of as being a snippet or segment of a line. Lines, Segments, and Rays Although we all know intuitively what a line is, it is actually difficult to give a good mathematical definition. How do we name a Ray? In geometry, a ray is a line with a single endpoint (or point of origin) that extends infinitely in one direction.

One will be an endpoint, the start of the ray. In the example shown below, P is the endpoint and Q is the point towards which the ray extends.

Because of this the two rays (QA and QB in the figure above) form a single straight line through the common endpoint Q. When naming a ray, it is denoted by drawing a small ray on top of the name of the ray. In plane geometry, a ray is easily constructed with two points. If you draw a ray with a pencil, examination with a microscope would show that the pencil mark has a measurable width. A ray is one-dimensional. So, the ray PQ is represented as: A ray has no measurable length, because it goes on forever in one direction.

A ray is named with its endpoint in the first place, followed by the direction in which its moving. A ray is also called half-line. The pencil line is just a way to illustrate the idea on paper.

Opposite rays are two rays that both start from a common point and go off in exactly opposite directions.

In geometry, a ray can be defined as a part of a line that has a fixed starting point but no end point.
It has zero width.

In geometry however, a ray has no width.

Roughly, we can say that a line is an infinitely thin, infinitely long collection of points extending in two opposite directions. Ray Definition In Geometry; How To Draw A Ray In Math; Ray Symbol & Label; Ray In Geometry Examples; Ray Definition In Geometry. It can extend infinitely in one direction. A ray is named based on the direction in which it extends. On its way to infinity, a ray may pass through more than one point.


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