Question 1093765
The perimeter of the 2x2 pool is {{{ 4*2 = 8 }}} m
It looks like Abby added {{{ 4 }}} m to that for the corners
{{{ 8 + 4 = 12 }}}
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If width  = {{{ x }}} and
length = {{{ y }}}, then
The number of slabs needed is:
{{{ 2x + 2y + 4 }}}
Get a 2nd opinion if needed