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Answer :
Let the length of the side of the square be x m.
So we have, Area of the square = \((side)^2 = x^2\; m^2\)
\(x^2 = 441 \)
\(\qquad \begin{array}{c|lcr}
&21\\
\hline
2 &\;\; \;\bar{4}\bar{41}\\
&-4\\
\hline
41 &\;\;\; 41\\
&\;\;\;41\\
\hline
&\;\;\;0\\
\hline
\end{array}
\)
\(\Rightarrow x =\sqrt{441} = 21\)
Hence the length of the side of square = 21 m.