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Homework Help: Showing vector is perpendicular to the plane

  1. Sep 9, 2008 #1
    if A, B, C are vectors from origin to the points A, B, C show that the following is perpendicular to the plane ABC: (AxB) + (BxC) + (CxA)

    I am having trouble setting up the problem. I cant understand the vector A, B, C. is vector A = Ai + Aj + Ak? and so on?
  2. jcsd
  3. Sep 9, 2008 #2
    Sorry for this post found out how to solve it.
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