Elementary Geometry for College Students (5th Edition)

Published by Brooks Cole
ISBN 10: 1439047901
ISBN 13: 978-1-43904-790-3

Chapter 11 - Section 11.2 - The Cosine Ratio and Applications - Exercises: 26


$\phi\approx63.4^{\circ}$ $\theta\approx26.6^{\circ}$

Work Step by Step

$\cos\phi=\frac{\sqrt5}{5}$ $\phi=\cos^{-1}\frac{\sqrt5}{5}$ $\phi\approx63.4$ $\sin\theta=\frac{\sqrt5}{5}$ $\theta=\sin^{-1}\frac{\sqrt5}{5}$ $\theta\approx26.6$
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