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15 August, 08:14

TriangleABC has three sides with these lengths: AB=9, BC=40, and CA=41, What is the value of cos C?

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  1. 15 August, 08:24
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    9² = 40² + 41² - 2 (40) (41) cos (C)

    81 = 1600 + 1681 - 3280 cos (C)

    81 = 3281 - 3280 cos (C)

    -3200 = - 3280 cos (C)

    cos (C) = 3200 / 3280

    cos (C) = 40 / 41
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