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Math Help - use the cosin forumla to solve the angles of a triangle

  1. #1
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    use the cosin forumla to solve the angles of a triangle

    a obtuse triangle with length ab=24 bc=36 and ac=49 use cos forumla to find its angles

    help plz...
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  2. #2
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    Cos rule: c^2 = a^2+b^2-2ab \cos(C)

    Plug and chug to find one angle then you can use the sin rule to find the second
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    MHF Contributor chisigma's Avatar
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    Quote Originally Posted by antikv View Post
    a obtuse triangle with length ab=24 bc=36 and ac=49 use cos forumla to find its angles

    help plz...
    Law of Cosines -- from Wolfram MathWorld

    Kind regards

    \chi \sigma
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