#### Answer

$s=\dfrac{2\pi}{3}$

#### Work Step by Step

Use the inverse cosine function of a calculator in radian mode to obtain:
$s=\cos^{-1}{(-\frac{1}{2})} = \frac{2\pi}{3}$

Published by
Pearson

ISBN 10:
013421742X

ISBN 13:
978-0-13421-742-0

$s=\dfrac{2\pi}{3}$

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