Answer:

Points in three-dimensional space are coplanar when they are in the same plane.



For example, B,C,D and E are coplanar but A,B,C and D are not. Any three points are coplanar. For example, A,B, and C are coplanar, A,E,C are coplanar etc and three distinct points are always coplanar; but four points in space are usually not coplanar.