They are lines or points that lie on the same plane.
Remember 3 or more points are collinear if they lie on the same line.
IF those lines lie on the same plane they are coplanar.
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because coplanar is coplanar and collinear is collinear!!
Yes, collinear points are also coplanar.
Any set of points that are collinear must be coplanar.
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.