A ≈ 615.75
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If the area of a circle is about 28 square inches the diameter is: about six inches (5.971).
The area of a circle with the diameter of 28 inches is: 615.8 square inches OR 4.28 square feet.
If the circumference of a circle is 28 inches the diameter is: 8.913 inches (circumference divided by Pi = diameter).
28"
It is: 2*radius = square root of (616/pi) = 28 inches to the nearest integer