we know that
surface area is sum of areas of all surfaces
we can see that
there are six surfaces
Out of which there are four rectangles and two trapezoid
so, we can find area of all surfaces
and then we can add them
[tex]S=3\times 9+3\times 9+3\times 6 +3\times 12+\frac{1}{2}\times 8\times (6+12)+ \frac{1}{2}\times 8\times (6+12)[/tex]
now, we can simplify it
and we get
[tex]S=3\times \:9+3\times \:9+3\times \:6+3\times \:12+8\left(6+12\right)[/tex]
[tex]S=27+27+18+36+144[/tex]
[tex]S=252m^2[/tex]
so, option-B..............Answer
