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Cos B = 0.2493

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  1. Calculator needed, or if you have an ol' fashioned math book with tables
    in the back ....

    Calc:
    press
    2ndF
    cos
    0.2493
    =

    you should get 75.56390633..°
    round off to the suggested accuracy, e.g. 1 decimal
    B = 75.6°
    BUT...
    the cosine is positive in quadrants I and IV , (know the CAST rule)
    so B = 360-75.6 ° = 284.4°

    in your book, find the closest to .2493 in the column of cosines
    Unless you know how to do interpolation, the best you can do is 76°

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