Question

100 ___________ = 1 square kilometre ($k{m}^2$).

• A. square decametres
• B. square decimetre
• C. square hectometres
• D. square centimetre

Answer 1

The correct option is C square hectometres

$1$ kilometre $=100$ decametre

So, $1$ square kilometre $=10000$ square decametre

$1$ kilometre $=10000$ decimetre $={10}^4$ square decimetre

So, $1$ square kilometre $={10}^8$ square decametre

$1$ kilometre $=10$ hectometre

So, $1$ square kilometre $=100$ square hectometre

$1$ kilometre $={10}^5$ centimetre

So, $1$ square kilometre $={10}^{10}$ square centimetre