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Let P and Q be two points and N a vector space in 3-space. Let P' be the point of intersection of the line through P, in the direction of N, and the plane through Q perpendicular to N. Prove that the distance between the plane and the point P is

[tex]\frac{|(Q-P) \cdot N|}{\|N\|}[/tex]

[tex]\frac{|(Q-P) \cdot N|}{\|N\|}[/tex]

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