If you want the area of a circle, and you know the diameter, then: A = pi*r^2, where r is the radius, and is 1/2 the diameter, so pi*(diameter/2)^2 = (pi/4)*(diameter)^2. If you want square inches, then make sure you have the diameter measurement in inches, first.
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The area of a circle with a diameter of 12 inches is: 113.1 square inches.
The area of a circle with a diameter of 16 inches is: 201.1 square inches.
The area of a circle that has a diameter of 14 inches is: 153.9 square inches.
The area of a circle with a diameter of 75 inches is: 4,418 square inches.
If the area of a circle is about 28 square inches the diameter of the circle is: about 6 inches (5.971).