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Homework Help: Angle between planes

  1. Sep 18, 2013 #1
    find the angle between planes:

    2x + y + 3z = 5
    2x + 3y + z = 7

    could someone double check this for me, I got 135.58 while the book got 44.4

    thanks :s
     
  2. jcsd
  3. Sep 18, 2013 #2
    135.6 and 44.4 add up to 180. Interesting, eh?
     
  4. Sep 18, 2013 #3
    yes I noticed that...
     
  5. Sep 18, 2013 #4
    is one the obtuse angle between the planes and the other the acute?
     
  6. Sep 18, 2013 #5
    Yep.
     
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