This is a straight application of the law of cosines...just be careful with SIGNS!
Hey L.
asked 11/15/21Hello! Pls help with this!
Given △𝐴𝐵𝐶 with 𝐴=127°, 𝑏 =6 and 𝑐 =9, find 𝑎. Round your answer to the nearest tenth.
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Yefim S. answered 11/15/21
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By Cosine Law: a2 = b2 + c2 - 2bccosA; a = √(36 + 81 - 2·6·9cos127°) = 13.5
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