A square doesn't have a radius. A circle has.
If the area of a square is 72 inches2, then each of its sides is 6 sqrt(2) = 8.485 inches. (rounded)
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Area of circle in square inches = pi*radius squared
The radius of a circle with an area of 35 square inches is 3.34 inches.
A circle with a radius of 26 inches has an area of: 2,124 square inches.
The area of a circle if the radius is 2.5 inches is: 19.63 square inches.
That will depend on what is meant by a 1.75 circle but the area of a circle is pi times radius squared