Answer
$193\ yd$.
Work Step by Step
Using the figure given in the exercise we use the Law of Cosines and let $AC=b$. Thus, we have
$b^2=140^2+160^2-2(140)(160)cos(80^\circ)\approx37,421$
which gives $b\approx193\ yd$.
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 6 - Section 6.2 - The Law of Cosines - Exercise Set - Page 730: 41
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