"Non-coplanar" means "not all in the same plane". Non-coplanar points are
a group of points that no matter how hard you tried or how many different
positions you checked, there's no way you could maneuver one flat sheet
of paper around in space so that all of the points could all lie on the same
paper at the same time.
Think of three corners of the floor, and one dot on the wall. No way that those
could all be on the same big sheet of paper, no matter how you move it around.
Any three points can always lie in the same plane. Four or more CAN be
all in the same plane, but they don't necessarily have to be.
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Non-coplanar lines refer to points operating or showing in different planes. None of the points are in the same plane.
It means that the points are not in the same plane.
3 coplanar points may or may not be collinear. 3 collinear points must be coplanar.
No. To prove this, you can actually construct the plane.
Three balls on a table are three coplanar points.