Answer
$c \approx 12$ inches
Work Step by Step
$ \frac{c}{sin(40)} = \frac{18}{sin(110)}$
$c = \frac{18sin(40)}{sin(110)}$
$c = \frac{11.6...}{0.939...}$
by GDC / calculator
$c = 12.31...$ inches
$c \approx 12$ inches
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