Answer
$24^{\circ}$
Work Step by Step
Let $\alpha$ be the angle formed by the ladder and the wall.
$\sin\alpha=\frac{4}{10}$
$\alpha=\sin^{-1}\frac{4}{10}$
$\alpha\approx24^{\circ}$
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 11.1 - The Sine Ratio and Applications - Exercises - Page 503: 33
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