The answer is not a rational number. It's the twice the square root of 1/pi inches, which comes out to just about 1 1/8".
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There are: pi*1*1 = pi square inches
Area = 0.785 square inches.
One square inch is a square that is 1 inch wide and 1 inch tall.
Less than an inch.
The area of a circle = (pi)(radius squared); radius = 1/2 the diameter. Therefore, this circle has an area of (pi)(52) = 79 square inches, to the justified number of significant digits.