They are rays that lie on the same line. For example draw a horizontal line. Now put 3 points anywhere on that line. Next draw 3 rays, some going to the left, some going to the right. These rays are collinear.
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Opposite Rays
Two collinear rays that do not intersect are called parallel rays. This will only occur for a short time, however, because they will intersect at some point.
One! That is what collinear means!
A vertex.