Angle between planes

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  • #1
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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
 

Answers and Replies

  • #2
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135.6 and 44.4 add up to 180. Interesting, eh?
 
  • #3
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135.6 and 44.4 add up to 180. Interesting, eh?
yes I noticed that...
 
  • #4
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is one the obtuse angle between the planes and the other the acute?
 
  • #5
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Yep.
 

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