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Ray
Ray: A straight" line that begins at a certain point and
extends forever in one direction. The point where the
ray
begins is known as its endpoint.
Naming Rays?
A ray is name starting from the end point. In the example
shown below, P is the endpoint and Q is the point towards
which the ray extends. So, the ray PQ is represented as:
QP with the arrow on top.
   example
naming ray
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