Answer
$68.5^\circ$
Work Step by Step
To find the angle, we use the inverse cos function on the calculator, making sure the calculator is in degrees mode:
$$
\cos B= 0.3666\Longrightarrow B=\cos^{-1} 0.3666=68.5^\circ
.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 13 - Section 13.1 - Trigonometric Ratios - Exercise - Page 454: 58
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