Answer
$$2.5 \ km^2.$$
Work Step by Step
Since $1\ ha =10^4 \ m^2 =\frac{10^4}{10^6}\ km^2$, so $1\ ha = 10^{-2} \ km^2 $. Now, to change $ha$ to $km^2$, we multiply by $10^{-2}$. That is,
$$250 \ ha=250\times 10^{-2} \ km^2=2.5 \ km^2.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 3 - Section 3.4 - Volume and Area - Exercise - Page 147: 48
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