Answer
$31.2~km^2$
Work Step by Step
$1~mi^2 \approx 2.6 ~km^2$
We can convert $12~mi^2$ to units of square kilometers.
$12~mi^2 = \frac{12~mi^2}{1}\times \frac{2.6~km^2}{1~mi^2} = 31.2~km^2$
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