Question 922023
For a square with side  = {{{s}}}
{{{ P = 4s }}}
{{{ 40 = 4s }}}
{{{ s = 10 }}} in
-------------
There would be {{{ 10 }}} tiles along a side,
and there would be {{{ 10 }}} rows of these
tiles to fill the {{{ 10*10 }}} square so
there are {{{ 10*10 = 100 }}} tiles total
---------------------------------