

Ray (Coordinate Geometry)
Definition: A
line
which starts at a
point
with given
coordinates,
and goes off in a particular direction to infinity,
possibly through a second point.
Try this
Adjust the ray below by dragging an orange dot and see how the ray
AB behaves. You can also drag the origin point at (0,0).
A ray is a
line
that starts at a given
point
and goes off for ever in some direction.
It may pass through another point as it does so.
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. The naming conventions are also the same.
Things to try
 In the above diagram, press reset. The ray AB has an endpoint A at (53,7) and
passes through point B at (53,20) on its way to infinity.
 Drag A, B or the origin point and construct various other rays to get a feel for the concept.
See also the definition of a Ray in plane geometry.
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