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Math Help - [SOLVED] Please check if correct

  1. #1
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    [SOLVED] Please check if correct

    Barron's SAT Math IIC Page 86

    Find the length of the longer diagonal of a parallelogram if the sides are 6 inches and 8 inches and the smaller angle is 60 degrees.

    Should it be like

    law of cosine c^2=a^2+b^2-2abcos60?
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  2. #2
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    c is the longer diagonal ...

    c^2=a^2+b^2-2ab\cos(120)
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