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Homework Help: Trigonometry Question

  1. Sep 20, 2004 #1
    Well, does anyone know how to solve for an angle of a triangle if you already have the measurements of all three sides? Any help would be appreciated.
  2. jcsd
  3. Sep 20, 2004 #2
    Yes, you can use the law of Cosines to find the measure of any angle given the three sides, or the third side given an angle and two sides.

    Try this link : http://hyperphysics.phy-astr.gsu.edu/hbase/lcos.html

    Remember, in the diagram, the angles are the Capital A, B, and C, and the sides are the opposite and are little a, b , and c.
    Last edited: Sep 20, 2004
  4. Sep 20, 2004 #3
    That is more than a hint ! :wink:
  5. Sep 20, 2004 #4
    You may still want to find out why the Law of Cosines is valid. I strongly suggest that you do. Check out the proof here.
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