Answer
$x = 8$ units
Work Step by Step
$x^{2} = (8)^{2} + (12)^{2} - 2(8)(12)cos(60)$
$x^{2} = 16 + 144 - 192cos(60)$
$x^{2} = 160 - 192cos(60)$
$x^{2} = 160 - 96$
$x^{2} = 64$
$x = \sqrt {64}$
$x = 8$ units
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Cengage
ISBN 10:
978-1-337-61408-5
ISBN 13:
978-1-33761-408-5
Chapter 11 - Test - Page 534: 19
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