Two lines in three-dimensional space are coplanar if there is a plane that includes them both. This occurs if the lines are parallel, or if they intersect each other. Two lines that are not coplanar are called skew lines.
The points that lie on the same plane are called coplanar points and hence the points that do NOT lie on the same plane are called non-coplanar points. We know that two points in 2D can always pass through a line and hence any two points are collinear.
Objects are coplanar if they lie in the same geometric plane. Typically, we refer to points, lines, or 2D shapes as being coplanar. Any points that lie in the Cartesian coordinate plane are coplanar. It doesn't matter what point because the coordinate plane lies in two dimensions.
Coplanar simply means “lying on the same plane.” Learn about coplanar points, coplanar lines along with their properties, facts and examples
In geometry, coplanar means that points, lines, or shapes all lie on the same flat surface, called a plane. A plane is like a perfectly flat sheet of paper that extends forever in all directions. Think of a tabletop - anything that sits completely flat on that tabletop is coplanar with the table.
In geometry, a plane is a two-dimensional, flat surface that extends infinitely in both directions. When points, lines, or other geometric objects lie on the same plane, they are said to be coplanar. If they do not lie on the same plane, they are called non-coplanar.
Definition: A set of vectors are said to be coplanar if they lie on the same plane. In other words, any linear combination of this set of vectors will also lie on that plane, that is, this set is linearly dependent.