The answer depends on the units used for 3 X 8. It should, for example, be obvious that the number of square inches in a 3 inch x 8 inch shape will be different to the number of square inches in a 3 foot x 8 ft area.
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Surface area of a 3 inch square is 54 inches.
3 inches
The surface area is 2*(8*11 + 11*3 + 3*8) square inches = 2*(88 + 33 + 24) sq inches = 290 square inches.
Total surface area = 2*(12*8 + 8*3 + 3*12) = 312 square inches.Total surface area = 2*(12*8 + 8*3 + 3*12) = 312 square inches.Total surface area = 2*(12*8 + 8*3 + 3*12) = 312 square inches.Total surface area = 2*(12*8 + 8*3 + 3*12) = 312 square inches.
A foot contains 12 inches. Therefore, 6 inches is half a foot and 8 inches is 2/3 foot. (2/3)(1/2) = 1/3 square foot.