Yes, collinear points are also coplanar.
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because coplanar is coplanar and collinear is collinear!!
Any set of points that are collinear must be coplanar.
not necassarily
A set of 3 points will always be coplanar, but will only sometimes be collinear. Collinear points are always coplanar as well.
Collinear points are points that lie on the same line, while coplanar points are points that lie on the same plane.