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7 July, 07:56

In triangle LMN, LM = 6, MN = 9, and LN = 7. Find m∠M to the nearest tenth of a degree.

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  1. 7 July, 08:24
    -1
    7^2 = 6^2 + 9^2 - 2 (6) (9) cos (m)

    -68 = 2 (6) (9) cos (m)

    cos (m) = - 0.6296

    m = arcos (-0.6296)

    m = 129.0 degrees
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