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reworked definition, hopefully to User:Ed Poor's standards
A ray is a [[Line Segment]] which starts at a given [[point]] and continues endlessly in one direction.
A '''ray''' is a portion of a [[line]] which starts at a given [[point]] and continues endlessly in one direction. Intuitively, it can be thought of as "half" a line because it extends [[infinite]]ly in only one direction rather than two, opposite directions as lines do. Of course, quantitatively, "half a line" is somewhat meaningless since a line is infinite and half of infinity is still infinity.
[[Category:Geometry]]
[[Category:Geometry]]