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: 29



Work Step by Step

Using the trigonometric ratios, we have $$ \cos B=\frac{length \ of \ side\ adjacent\ angle\ B}{length\ of\ hypotenuse}\\ =\frac{31}{62}=0.5 .$$
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