Answer
100 ha
Work Step by Step
We use unit conversions to solve this problem:
$1km^2=1km^2\times(\frac{1000m}{1km})^2\times\frac{1ha}{10,000m^2}=1km^2\times\frac{1,000,000m^2}{1km^2}\times\frac{1ha}{10,000m^2}=\frac{1,000,000}{10,000}ha=100ha$