Elementary Geometry for College Students (5th Edition)

Published by Brooks Cole

Chapter 11 - Section 11.2 - The Cosine Ratio and Applications - Exercises: 34

Answer

$70.5^{\circ}$

Work Step by Step

$\cos\alpha=\frac{10}{30}$ $\alpha=\cos^{-1}\frac{10}{30}$ $\alpha\approx70.5$

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