�Note   If d is the distance from the origin and l, m, n are the direction cosines of
the normal to the plane through the origin, then the foot of the perpendicular is
(ld, md, nd) 11 6 2Equation of a plane perpendicular to a
given vector and passing through a given point
In the space, there can be many planes that are
perpendicular to the given vector, but through a given
point P(x1, y1, z1), only one such plane exists (see
Fig 11