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February 3rd, 2011, 06:52 AM  #1 
Newbie Joined: Feb 2011 Posts: 3 Thanks: 0  Angle between two planes, urgent!
The task is sounds as following: A plane (alpha) goes has the equation 2x+y+2z1=0 Another plane (beta) is parallel with the vectors [1,1,2] and [2,1,5]. Find the angle between the planes. At the moment, I have really no idea how I should solve this, so if someone could point me in the right direction, I would be very happy. Thanks in advance, Chris. 
February 3rd, 2011, 08:14 AM  #2 
Newbie Joined: Feb 2011 Posts: 3 Thanks: 0  Re: Angle between two planes, urgent!
Allright, well I solved this myself, so never mind! 
February 3rd, 2011, 09:02 AM  #3  
Math Team Joined: Dec 2006 From: Lexington, MA Posts: 3,267 Thanks: 407  Re: Angle between two planes, urgent! Hello, Skovisen! You solved it . . . Good for you! Quote:
Here's my approach . . . [color=beige]. . [/color] [color=beige]. . [/color]  
February 3rd, 2011, 10:54 AM  #4 
Newbie Joined: Feb 2011 Posts: 3 Thanks: 0  Re: Angle between two planes, urgent!
Exactly what I did myself! Just took me some time to figure it out, but turned out to be not as hard as I first thought.


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