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Two planes \(\mathscr{P}\) and \(\mathscr{P}'\) with normal vectors \(\Vect{n}\) and \(\Vect{n}'\) are perpendicular if:
\(\Vect{n} \cdot \Vect{n}' = 0\).
\(\Vect{n}\) and \(\Vect{n}'\) are collinear.
\(\Vect{n} = \Vect{n}'\).
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