Answer
$= 52.0$ cm$^{2}$
Work Step by Step
$A = \frac{1}{2}absin(C)$
$= (0.5)(10)(12)sin(120)$
$= (0.5)120sin(120)$
$=(0.5)(103.92304...)$
$= 51.9615....$ cm$^{2}$
$= 52.0$ cm$^{2}$
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