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 12) Let a plane pass  through a point A with position
vector ar  and perpendicular to the vector N
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