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Math Help - Unit Vector

  1. #1
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    Unit Vector

    Find a unit vector with positive first coordinate that is orthogonal to the plane through the points P = (-5, 3, 3), Q = (0, 8, 8), and R = (0, 8, 12)
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  2. #2
    MHF Contributor Calculus26's Avatar
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    Let u be the vector from P to Q and v be the vector from Q to R

    Then the normal to the plane is N = uxv

    If the x component is negative use -N

    To make it a unit vector use N/|N|
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