Not sure about complanar. Coplanar lines can be collinear but need not be.
A point or, if the lines are also collinear, the line(s).
Lines or points lying on the same plane
No, non-coplanar lines are not skew. Skew lines are non-coplanar lines that do not intersect and are not parallel. Non-coplanar lines are simply lines that do not lie in the same plane. Skew lines, on the other hand, are non-coplanar and not parallel, making them a specific subset of non-coplanar lines.
They are coplanar. ANY 2 lines would be coplanar, however a third line can be outside of the plane. just like 3 points will designate a plane and a triangle
Not sure about complanar. Coplanar lines can be collinear but need not be.
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.
only 1 lines can contain 3 collinear points. Maybe you mean coplanar?
3
3
There are 13*12/2 = 78 lines.
A point or, if the lines are also collinear, the line(s).
# 1
Any three non-collinear points will define a single plane. A plane is composed of an infinite number of distinct lines.
4*3/2 = 6 lines.
As long as at least two of them are different points, exactly one line.
Points and lines on the same plane are coplanar.