👉 Coplanar, also known as co-planar or co-orientable, refers to two or more geometric shapes that are parallel in space. Coplanarity signifies that both shapes are in the same plane, meaning they have identical positions and orientations relative to each other. In three-dimensional space, coplanarity can be represented by a set of three points being collinear (or at the same point) with respect to any two or more other points.