The diameter of a 28-square inch circle is: 5.971 inches.
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area is pi r 2 and radius is half diameter.
therefore 3.14 x (28/2)2 is area, = 615.44inches squared
If the area of a circle is about 28 square inches the diameter of the circle is: about 6 inches (5.971).
Circumference of the circle: 28*pi inches
Area = 615.75
A circle with a diameter of 28 is a circle.
The diameter is 5.97 inches.