Answer
$50.01^\circ$
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:
$$
\cos A= 0.6427\Longrightarrow A=\cos^{-1} 0.6427=50.01^\circ
.$$
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: 70
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