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It depends on what the name of the initial point is because that defines the direction of the ray. If the initial point is c, then the ray must be called cd, but if the initial point is d, then the ray must be called dc.
the point is wat it is called and its the little dot where it originates
a ray is (any of the thin lines, or beams, of light that appears from a bright source)
A ray is a part of a line.it is one end point and goes on and on in one diredction.You name the endpoint that is first.
A ray has only one end point.