## Thinking Mathematically (6th Edition)

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