-- Two rays with a common endpoint form an angle.
-- If they have a common endpoint, then they are collinear. So I guess,
technically, the conditions described in the question aren't possible.
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A vertex.
Definition for collinear and non collinearPoints that lie on the same line are called collinear points. If there is no line on which all of the points lie, then they are non collinear points.
The definition of a non-collinear line is that this is a line on which points do not lie on one line. The opposite of this is a collinear point. Collinear points refer to three points that do fall on a straight line.
yes
Parallel sides, non-adjacent sides, skew sides in 3-d shapes.