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13 February, 16:02

A=14cm b=9cm c=6cm law of cosines

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  1. 13 February, 16:45
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    A^2 = b^2+c^2 - 2bc•cosA

    14^2 = 9^2 + 6^2 - 2x9x6xCosA

    196 = 81 + 36 - 108xCosA

    196 - 117 = 108CosA

    79/108 = cos A

    0.7315 = cosA

    A = cos^-1 (0.7315)

    A = 42.98

    SineA/a=sineB/b = sineC/c

    Sin42.98/14 = sineB/9

    B = sin^-1 ((9•sin42.98) / 14)

    B = 25.99

    C = 180 - (25.99 + 42.98)

    C = 111.03
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