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Trignometry Proof Help

  1. Apr 8, 2010 #1
    Trignometry Proof Help!!!

    If a,b,c are sides in a triangle such that a<1/2(b+c) show that angle A (the angle opposite to side a) is less than 60 degrees
     
    Last edited: Apr 8, 2010
  2. jcsd
  3. Apr 8, 2010 #2

    mathman

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    Re: Trignometry Proof Help!!!

    Have you tried the law of cosines?

    a2=b2+c2-2bccosA
     
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