No, they have to be noncolinear, that is they all can't be on the same line.
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To create a plane, infinitely many. But to uniquely define one, 3 are enough.
There are an infinite number of any kind of points in any plane. But once you have three ( 3 ) non-collinear points, you know exactly which plane they're in, because there's no other plane that contains the same three non-collinear points.
3
Only one plane can pass through 3 non-collinear points.
I guess 3 . Take these 3 points 2 at a time . These two points would be the diameter of the circle .