Math

Given ABC with a = 6, b = 18, and mC 88° , find c. Round the cosine value to the nearest thousandth and answer to the nearest hundredth.
Now I got 28.32

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  1. c^2 = a^2 + b^2 - 2 a b cos C
    88 is very close to 90 so approximately
    c^2 = 36 + 324 = 360
    c = about 19 so not 28.whatever

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