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Homework Help: Two unit vectors that are normal to the plane

  1. Feb 14, 2012 #1
    1. The problem statement, all variables and given/known data
    Find two unit vectors that are normal to the plane determined by the points A(0,-2,1), B(1,-1,-2), and C(-1,1,0)

    I found the cross-product of the two position vectors then i got 8i+4j+4k then i divided that by the magnitude to get the unit vector but how do i find the other one? can i just add a coefficient in front of the unit vector?
    Last edited: Feb 14, 2012
  2. jcsd
  3. Feb 14, 2012 #2


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    Science Advisor

    Take the opposite direction.
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