Answer
63.6 degrees
Work Step by Step
Using the given triangle, we find:
$$ cos\theta = \frac{4}{9} \\ \theta = cos^{-1}(\frac{4}{9}) \\ \theta = 63.6^{\circ}$$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 13, Trigonometric Ratios and Functions - 13.3 Evaluate Trigonometric Functions of Any Angle - Guided Practice for Examples 3 and 4 - Page 877: 11
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