Lines go from one point to another points or they can go on infinitely. Lines that are collinear means that they are imposed over each other.
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the lines which are not parallel to each other are non collinear lines
None. In ordinary geometry, a line contains an infinite number of points and, by definition, they are all collinear. In projective geometry, however, you can have three lines in the form of a triangle. Each line has only two points on it, so it cannot have 3 points collinear.
No. Collinear means on the same line. So collinear points all must lie on the same line. Not parallel lines.
Yes.
parallellines