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Engineering mechanics help

  1. Jul 10, 2011 #1
    http://imageshack.us/f/560/engineeringmechproblem.jpg/

    I have a question about this problem, i was wondering where they got the cos 125degrees as well as the a=13.4 degrees. If anyone knows how they got this answer can you please tell me how?
     
  2. jcsd
  3. Jul 10, 2011 #2

    PhanthomJay

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    Looks like someone made an error. That should be cos 135 degrees (180 - 15 - 30 = 135) and the rest should follow.
     
  4. Jul 10, 2011 #3
    lmfao thanks a lot bro, i was wondering for sooooo long how they got that :P
     
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