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.
Two lines may or may not lie in the same plane, depending on their relationship. If the lines are parallel or intersecting, they exist in the same plane. However, if the lines are skew, meaning they do not intersect and are not parallel, they lie in different planes. Thus, whether two lines lie in the same plane is contingent on their geometric arrangement.
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
Parallel Lines.
they lie in the same plane