Answer
$0.5$
Work Step by Step
Using the trigonometric ratios, we have
$$
\cos B=\frac{length \ of \ side\ adjacent\ angle\ B}{length\ of\ hypotenuse}\\
=\frac{31}{62}=0.5
.$$
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: 29
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