Angle Between Planes: Calculating the Angle Between Two 3D Planes

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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
 
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135.6 and 44.4 add up to 180. Interesting, eh?
 
voko said:
135.6 and 44.4 add up to 180. Interesting, eh?

yes I noticed that...
 
is one the obtuse angle between the planes and the other the acute?
 
Yep.
 

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