Answer
c. $220 \, in^2 $
Work Step by Step
$C = 180-(A+B) = 53^\circ$
$S = \dfrac{c^2 \sin{A} \sin{B}}{2 \sin{C} } = \dfrac{(21)^2 \sin{56} \sin{71}}{2\sin{53}}$
$S= 220 \, in^2 $
Trigonometry 7th Edition
by McKeague, Charles P.; Turner, Mark D.
Published by
Cengage Learning
ISBN 10:
1111826854
ISBN 13:
978-1-11182-685-7
Chapter 7 - Section 7.4 - The Area of a Triangle - 7.4 Problem Set - Page 397: 42
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