3 inches
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The area of a 3-inch square is: 9 square inches.
Surface area of a 3 inch square is 54 inches.
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.
One square foot is 12 inches by 12 inches so you can fit in it 9 tiles in a 3 tiles by 3 tiles square.
There is no sensible answer to this question. A square foot is a measure of area, with dimensions [L2]. An inch is a measure of distance, with dimensions [L]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions without additional information.