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Triangle formula

  1. Nov 4, 2004 #1
    if you know the side lengths of an isocolese triangle and nothing else, then can you find the angle measures of that triangle? is there a formula for this?
  2. jcsd
  3. Nov 4, 2004 #2
    Do you know the cosine rule?

    If a = BC, b = CA, c = AB then

    [tex]\cos C = \frac{a^2 + b^2 - c^2}{2ab}[/tex]
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