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Line (geometry) - Wikipedia, the free encyclopedia
In Euclidean geometry, a line is a straight curve. When geometry is used to model the real world, lines are used to represent straight objects with negligible width and height.
Basic Terms
A ray is one of the basic terms in geometry. We may think of a ray as a "straight" line that begins at a certain point and extends forever in one direction.
Ray (geometry) - MSN Encarta
Ray geometry, portion of a line limited at one end by a point but extending to infinity in the other direction. A laser beam is similar to a ray: It..

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Ray (geometry)

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Ray (geometry), portion of a line limited at one end by a point but extending to infinity in the other direction. A laser beam is similar to a ray: It has a definite beginning point (the laser) but no endpoint (the light continues forever unless something gets in the way). Rays are often designated according to their endpoints and a point through which they pass; a ray with endpoint A that passes through point B may be denoted .