Question:
If $m$ is the square of a natural number $n$, then $n$ is
(a) the square of $m$
(b) greater than $m$
(c) equal to $m$
(d) $\sqrt{m}$
Solution:
(d) Given, $m$ is the square of $n, \mathrm{i}_{4} e . m=n^{2}$
Taking square root both sides, we get
$n=\sqrt{m}$