A plane.
A circle can also pass through three non-co-linear points.
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Of course. The vertices of a triangle, and any three vertices of any other polygon, are non-collinear. In the case of a triangle and a quadrilateral, if you had three collinear vertices, then you couldn't have the polygon.
Collinear points are points that lie on the same line. Noncollinear points do not lie on the same line. Any two points are always collinear, i.e. forming a line. Three or more points can be collinear along a single line.Collinear points lies on the same straight line.
I think you mean: Are any three points contained in exactly one plane? only if they're not collinear... I think
In 3-dimensional space, yes, any three points are coplanar.
== == Through any two points there is exactly one straight line.