There are several definitions of a ray.

When viewed as a vector, a ray is a vector AB^-> from a point A to a point B.

In geometry, a ray is usually taken as a half-infinite line (also known as a half-line) with one of the two points A and B taken to be at infinity.

See also

Interval, Line, Line Segment, Vector

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Cite this as:

Weisstein, Eric W. "Ray." From MathWorld--A Wolfram Web Resource.

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