Area of a square is 57,121m^2.Find the length of its side.

Area of square = ${\left(\mathrm{side}\right)}^2 = 57121 {\mathrm{m}}^2$
$\Rightarrow \mathrm{side} = \sqrt{57121} = 239 \mathrm{m}$
Therefore length of each side of square is 239 m.