we know that
one square mile is equal to \(258.999\ hectares\)
so
by proportion
\(\frac{258.999}{1} \frac{hectares}{square\ miles} =\frac{x}{50} \frac{hectares}{square\ miles}\\\\ x=50*258.999= 12,949.95\ hectares\)
therefore
the answer is
\(12,950\ hectares\)