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11 August, 05:39

In triangle ABC, a = 2, c = 6, and cos B =. Find b.

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  1. 11 August, 06:05
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    Use Law of Cosines, which is ß² = α² + c² - 2αccos (B) where
    Let α = 2, c = 6 and cos (B) = 1/6, so

    ß = √ (2² + 6² - 2 (2) (6) (1/6))

    = √ (4 + 36 - 4)

    = √36 = 6
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