The equation for the area of a square is:

\(\displaystyle{A}={s}^{{2}}\)

We are given A=441 and thus

\(\displaystyle{s}=√{A}=√{441}√={21}{c}{m}\)

\(\displaystyle{A}={s}^{{2}}\)

We are given A=441 and thus

\(\displaystyle{s}=√{A}=√{441}√={21}{c}{m}\)