Answer
16.928
Work Step by Step
Using the law of cosines, we have
$PQ=\sqrt {10^{2}+8^{2}-2\times10\times8\times\cos\frac{7\pi}{9}}=16.928$
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 1 - Precalculus Review - 1.4 Trigonometric Functions - Exercises - Page 31: 59
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