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The other point is merely a signpost a way to give the ray a name.
Definition of a ray in geometry math. The sun is the endpoint and the ray. It can extend infinitely in one direction. A ray is one dimensional. A ray is a line that starts at a given point and goes off for ever in some direction.
One will be an endpoint the start of the ray. A ray is named based on the direction in which it extends. A ray has no measurable length because it goes on forever in one direction. A ray is a part of a line that begins at a particular point called the endpoint and extends endlessly in one direction.
It may pass through another point as it does so. In geometry however a ray has no width. It has zero width. A ray is named with its endpoint in the first place followed by the direction in which its moving.
A part of a line with a start point but no end point it goes to infinity try moving points a and b. A ray is also called half line. It may pass through another point as it does so. On its way to infinity a ray may pass through more than one point.
How do we name a ray. An example of a ray is a sun ray in space. A ray can be thought of as being a snippet or segment of a line. In plane geometry a ray is easily constructed with two points.
This is the same as the definition of a ray in ordinary plane geometry the only difference being that we know the coordinates of the points involved. In geometry a ray can be defined as a part of a line that has a fixed starting point but no end point. The pencil line is just a way to illustrate the idea on paper. In geometry a ray is a line with a single endpoint or point of origin that extends infinitely in one direction.
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