Answer
$\phi\approx63.4^{\circ}$
$\theta\approx26.6^{\circ}$
Work Step by Step
$\cos\phi=\frac{\sqrt5}{5}$
$\phi=\cos^{-1}\frac{\sqrt5}{5}$
$\phi\approx63.4$
$\sin\theta=\frac{\sqrt5}{5}$
$\theta=\sin^{-1}\frac{\sqrt5}{5}$
$\theta\approx26.6$
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
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 - Page 510: 26
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