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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The area of a circle that has a circumference of 18 is 25.78 inches squared.
11.5 (sq inches) = 74.1934 sq. centimeters
630 cm squared equals 97.65 inches square.
It is 35*122 = 5040 sq inches.
9pi inches squared