Points that are collinear will be located on the same line. A line is a subset of a plane. Therefore, Yes, points that are collinear will be located on the same plane.
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.
collinear
Yes.
collinear plane
Collinear is passing through or lying on the same staright line. Coplanar is lying on or occurring in the same plane.
Three
For instance a plane.
A plane
There are 3 ways to fix a plane. 1. Three non-collinear points . 2. A line and a point not on the line. 3. Two intersecting but non-collinear lines
Any three non-collinear points will define a single plane. A plane is composed of an infinite number of distinct lines.
Three collinear points don't define a plane."Define" means narrow it down to one and only one unique plane, so that it can't be confused with any other one.There are many different planes (actually infinite) that can contain three collinear points, so no unique plane is defined.