Circle area = Pi * r^2
r = d/2
Since d=28. r=14.
28^2 = 196
The area is 196 Pi or approximately 615.75 square feet.
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The area of a circle with the diameter of 28 inches is: 615.8 square inches OR 4.28 square feet.
Circumference of a circle: 2*pi*radius or diameter*pi Area of a circle: pi*radius squared
A ≈ 615.75
If the area of a circle is about 28 square inches the diameter is: about six inches (5.971).
If the circumference of a circle is 28 inches the diameter is: 8.913 inches (circumference divided by Pi = diameter).