Elementary Geometry for College Students (5th Edition)

Published by Brooks Cole
ISBN 10: 1439047901
ISBN 13: 978-1-43904-790-3

Chapter 11 - Review Exercises - Page 532: 3

Answer

Cosine ratio. $c=23.0$ in.

Work Step by Step

$\cos80^{\circ}=\frac{4}{c}$ $c=\frac{4}{\cos80^{\circ}}$ $c=23.0$ in.
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