Elementary Technical Mathematics

Published by Brooks Cole
ISBN 10: 1285199197
ISBN 13: 978-1-28519-919-1

Chapter 13 - Section 13.1 - Trigonometric Ratios - Exercise - Page 454: 63



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: $$ \cos A= 0.3572\Longrightarrow A=\cos^{-1} 0.3572=69.07^\circ .$$
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