High Quality Content by WIKIPEDIA articles! In geometry, a set of points in space is coplanar if all the points lie in the same geometric plane. For example, three distinct points are always coplanar; but a fourth point or more added in space can exist in another plane, incoplanarly. Points can be shown to be coplanar by determining that the scalar product of a vector that is normal to the plane and a vector from any point on the plane to the point being tested is 0. To put this another way, if you have a set of points which you want to determine are coplanar, first construct a vector for each point to one of the other points (by using the distance formula, for example). Secondly, construct a vector which is perpendicular (normal) to the plane to test (for example, by computing the cross product of two of the vectors from the first step). Finally, compute the dot product (which is the same as the scalar product) of this vector with each of the vectors you created in the first step. If the result of each dot product is 0, then all the points are coplanar.

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