615.75 square inches.
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If the area of a circle is about 28 square inches the diameter of the circle is: about 6 inches (5.971).
The diameter is 5.97 inches.
28.00563 inches, roughly equal to 28 inches
Area = pi*r2 where r is the radius. So Area = 28 sq inches gives radius = 2.985 inches and then, diameter = 2*radius = 5.971 inches.
The diameter of a 28-square inch circle is: 5.971 inches.