yes
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Collinear points
Four non-collinear points can form exactly one plane. This is because a plane is defined by three non-collinear points, and adding a fourth point that is not in the same line as the other three does not create a new plane; rather, it remains within the same plane defined by the initial three points. Therefore, all four points lie in the same unique plane.
Yes.
Three non-collinear points always define exactly one and only one plane. That's why a 3-legged table or chair never wobbles.
For instance a plane.