In geometry, a set of points in space's coplanar if the points all lie in the same geometric plane. For example, three distinct points are always coplanar; but four points in space are usually not coplanar. Points can be shown to be coplanar by determining that the scalar product of a vector that's normal to the plane and a vector from any point on the plane to the point being tested's 0. To put this another way, if you've a set of points which you want to determine are coplanar, first construct… (More on Coplanarity)