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Question

# determine whether the Law of Sines or the Law of Cosines is needed to solve the triangle at the left, then solve the triangle. Round your answers to two decimal places. A = 45°, B = 26°, c = 20

Solutions

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Firstly, we can see that we can easily find the last remaining angle of the triangle.

\begin{align*} C&=180\degree-A-B\\ &= 180 \degree-45\degree-26\degree\\ &=109\degree \end{align*}

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