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Math Help - Triangle trigonometry

  1. #1
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    Triangle trigonometry

    - A triangular region has sides measuring 121, 173, and 194 meters. Find the measure of the largest angle in the region.

    How should I do this?
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  2. #2
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    Quote Originally Posted by PandaPanda View Post
    - A triangular region has sides measuring 121, 173, and 194 meters. Find the measure of the largest angle in the region.

    How should I do this?
    The largest angle is the one that is opposite the largest or longest side....here, the angle that is the opposite of 194.
    Say, call that the angle C.

    So, using the Law of Cosines,
    (194)^2 = (121)^2 +(173)^3 -2(121)(173)cos(C)

    C = 80.466534 degrees -------answer.
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