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2 February, 11:09

Select the angle that correctly completes the law of cosines for this triangle. 72 + 252 - 2 (7) (25) cos ___ = 242 A. 180° B. 90° C. 16° D. 74°

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  1. 2 February, 13:28
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    x = 76.45 degrees

    Step-by-step explanation:

    72 + 252 - 2 (7) (25) cos _x__=242

    combine like terms

    324-350cosx = 242

    subtract 324 from each side

    -350x = - 82

    divide by - 350

    cos x = - 82/-350

    cos x = 82/350

    take the arccos of each side

    arccos (cos x) = arccos (82/350)

    x = 76.45 degrees
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