Answer
$\approx 29^o$
Work Step by Step
In DEG mode, use a calculators inverse cosine ($\cos^{-1}{}$) function to obtain:
$\cos^{-1}{0.877} \approx 29^o$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 4 - Section 4.3 - Right Triangle Trigonometry - Exercise Set - Page 561: 36
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