Question 258136
Surface area formula is:
(i) {{{SA = 2L + 2W + 2H}}}
From above, we get
(ii) {{{SA = 2*4 + 2*12 + 2*18}}}
so,
{{{SA = 8 + 24 + 36}}}
or simply
{{{SA = 68}}} sq. in.