Coplanar.
they lie in the same plane
Noncoplanar is a term in geometry referring two or more figures, lines, or points that do not all lie in the same plane.
coplanar (which means that they lie on the same plane)
Two lines can lie in one plane. For example, parallel lines are lines that intersect and lie in the same plane.
Points on the same plane are coplanar lines.
skew
Coplanar points lie on the same plane. A plane is a flat, two-dimensional surface that extends infinitely in all directions. Coplanar points can be thought of as points that all lie in the same plane and can be connected by straight lines without leaving that plane.
skew lines
Parallel Lines.
parallel
they lie in the same plane
If two points are coplanar, they lie on the same plane.