Answer:
72
Step-by-step explanation:
We can use the equation A=2(wl+hl+hw) to calculate surface area. All we have to do is substitute the known values.
A=2(3(2)+6(2)+6(3)
Now, simplify.
A=2(6+12+18)
A=2(36)
A=72
The total surface area is 72.
Hope this helps!
