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13 April, 16:18

Given b = 12, c = 15 and A = 60° in triangle ABC, use the Law of Cosines to solve for a. Fill in the blank (s) to complete each step. If applicable, be sure to enter all decimal numbers with a zero in the ones place. Round your final answer to the nearest hundredth.

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  1. 13 April, 19:05
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    A^2 = b^2 + c^2 - 2bc * cos (A)

    a^2 = 144 + 225 - 360 *.5

    a^2 = 189

    a = 13.748
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