Math: law of cosines, help?

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  • 4 months ago
    Favourite answer

    Apply law of sin

    ....a...............b

    ----------- =----------

    ..sin(A).......sin(B)

    ....12...............15

    ------------ =--------------

    ..sin(33)........sin(B)

    ...12sin(B) = 15sin(33)

    sin⁻¹(B) = 0.68

    B = 43°  Answer//

    Answer is B. 43

  • fcas80
    Lv 7
    4 months ago

    Law of Sines: sin B/15 = sin33/12

    sinB = 15 * sin33/12

    sin33 = .5446

    sinB = 15 * .5446/12 = .681

    arcsin(.681) = 42.92.  answer B

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