You would use square inches if you were trying to measure the area of a 2D shape.
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There are 144 square inches in a square foot. The answer would be 11,232 square inches.
Use this formula to convert from square inches to square feet, : square inches x 0.00694 = square feet
9 times 13 = 117 square inches
A square that is six inches on a side would have an area of 36 square inches.
There are 144 square inches in a square foot. There would be 7,200 square inches.