Answer
$70.5^{\circ}$
Work Step by Step
$\cos\alpha=\frac{10}{30}$
$\alpha=\cos^{-1}\frac{10}{30}$
$\alpha\approx70.5$
Elementary Geometry for College Students (6th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
9781285195698
ISBN 13:
978-1-28519-569-8
Chapter 11 - Section 11.2 - The Cosine Ratio and Applications - Exercises - Page 504: 34
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