There are no inches in an square inch. Square inches are units of area and inches are units of length, the two can not be equated.
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An inch is a unit of length. A square inch is a unit of area. The two units are therefore incompatible.
3 inches
There are: pi*1*1 = pi square inches
256*pi square inches Area of a circle = pi*radius2
The area of a 3-inch square is: 9 square inches.
15.5 sq inch = 1 sq decimeter