You can put this solution on YOUR website! There are two full lengths*widths, which are 8*12=96 (192 doubled) units ft^2
There are two ends, which are 8*4 feet=32 (64 ft^2 doubled)
There are two lengths and thicknesses, or 12*4=48 (96 ft^2 doubled)
They add to 352 ft^2.