Answer
$\approx 110.03$
Work Step by Step
From the law of cosines
$x^{2}=100^2+210^{2}-2\times 100\times 210 \times cos40^0\Rightarrow x=\sqrt {1002+210^{2}-2\times 100\times 210\cos 40^0}\approx 110.03$
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 6 - Review - Exercises - Page 529: 71
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