Answer:
600ft^2
Step-by-step explanation:
Step One: There are two identical faces of each, which means we can multiply each face times two to make it faster. The first face will be 2(4*12)=96. I muliplied by two, because, once again, there are two faces of each.
Step Two: The next is 2(18*12)=432 and lastly, 2(4*18)= 72
Step Three: We just have to add it all up: 72+96+432= 600ft^2
