Elementary Geometry for College Students (7th Edition) Clone

Published by Cengage
ISBN 10: 978-1-337-61408-5
ISBN 13: 978-1-33761-408-5

Chapter 11 - Section 11.2 - The Cosine Ratio and Applications - Exercises - Page 512: 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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