Calculus (3rd Edition)

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



Work Step by Step

Using the law of cosines, we have $PQ=\sqrt {10^{2}+8^{2}-2\times10\times8\times\cos\frac{7\pi}{9}}=16.928$
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