144 square feet.
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You don't. You either A) convert 18 cubic inches into cubic feet, or B) convert 18 square inches into square feet. A... there are 1728 cubic inches in a cubic foot, so 18 cu in would be 0.00104 cu ft. B... there are 144 square inches in a square foot, so 18 square inches would be 0.125 sq ft.
62,208 square inches.
2.25 square feet.
Before a calculation of this sort, the measurements must both be in the same unit.... as inches cannot be multiplied by feet to give a meaningful result. So, as square feet are being sought, convert the 18 inches to feet. This gives a figure of 1.5 feet. Now we can do the calculation for area - multiply the length by the width. 3 x 1.5 = 4.5 This is square feet, so the answer is 4.5 square feet.
You cannot convert '18 x 13' to square feet, because you have NOT hiven the units of '18' nor '13' .