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19 October, 21:33

Given a triangle with b = 3, c = 9, and A = 21 ° what is the length of a? Round to the nearest tenth

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  1. 20 October, 00:06
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    Use the Law of Cosines

    a^2 = b^2 + c^2 - 2bc * cos (A)

    a^2 = 9 + 81 - (54 * 0.93358)

    a^2 = 90 - 50.41332

    a^2 = 39.58668

    a = 6.2917946565

    a = 6.3 (rounded)
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