A Square Inch is a measurement of 1" X 1" used to measure area. It is the area inside a square that (as all squares do) has four equal sides that each measure an inch. Its as simple as I can put it.
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1 square ft= 144 square inch
1 inch = 2.54 centimeters1 sqare inch = 6.4516 square centimeters
One square inch is 1/144 of a square foot.1 square inch = 0.006944 square foot (rounded)1 square foot = 144 square inches
An area of 1 square inch!
2.78 square feet.