None.
An inch is a measure of length or distance while a square inch is a measure of area. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
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144 square inches make one square foot Each square inch is 0.006944 of one square foot. (rounded)
The area of a circle with an 8 inch diameter is approximately 50.27 square inches.
12 square inches.
19.63 square inches are in the area of a 5-inch diameter circle.
The area of a 3-inch diameter circle is about 7.068 square inches.