Question

100 square decametres = __________ .

• A. $1$ hectare (ha)
• B. $10$ square hectometre ($h{m}^2$)
• C. 1 square kilometre ($k{m}^2$)
• D. 100 square metre

Answer 1

Answer: (A)

$1$ hectare (ha)

$1$ decametre $=10$ metre or $1$ square decametre $=100m^2$ and $1$ hectare $={10}^4{m}^2$

Thus, $1$ hectare $=100$ sqaure decametre

$1$ hectometre $=100m=10$ decametre

So, $1$ square hectometre $={10}^2$ square decametre

Now $10$ square hectometre $={10}^3$ square decametre

$1km=1000m=100$ decametre

So, $1k{m}^2={10}^4$ sqaure decametre