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Homework Help: Coplanar Parallelepiped

  1. Apr 17, 2008 #1
    I have just completed a question in which I have determined:

    (axb).c = 0 = det [a,b,c]

    Where: a = (1,1,2) b = (2,3,4) c = (1,-2,2)

    With some googling, I established this meant the parallelepiped to be coplanar but I'm not sure exactly what this means. If anyone could offer me some assistance with this I would be most grateful.

  2. jcsd
  3. Apr 17, 2008 #2


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    It means that all of the edges of your parallelepiped lie in the same plane. So the box is squashed flat and has no volume.
  4. Apr 17, 2008 #3
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