Answer
$x \approx 13.7$
Work Step by Step
The Law of Cosines must be used in the form $c^{2}=a^{2}+b^{2}-2ab\cos{C}$.
$c^{2}=a^{2}+b^{2}-2ab\cos{C}$
$x^{2}=12^{2}+15^{2}-2(12)(15)\cos{60°}$
$x^{2} = 189$.
$x = \sqrt {189}$
$x \approx 13.7$
Algebra 2 Common Core
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133186024
ISBN 13:
978-0-13318-602-4
Chapter 14 - Trigonometric Identities and Equations - 14-5 The Law of Cosines - Practice and Problem-Solving Exercises - Page 939: 9
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