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Geometry, planes

  1. Mar 12, 2012 #1
    I do not understnad how x+y+z=0 can be a plane, I thought a plane has 2 dimensions, this is all :) thanks.
     
  2. jcsd
  3. Mar 12, 2012 #2
    A plane is a two dimensional object, but it can be rotated into three dimensions. Another way of looking at it is that you only need two coordinates to express a point on the plane (hence it being 2-dimensional), but it can be embedded in a space consisting of an arbitrary amount of dimensions, in which case you could need more variables to express it.
     
  4. Mar 12, 2012 #3
    Ahh of course - cheers !
     
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