The area of a 18-inch diameter circle is: 254.5 square inches.
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Area = pi*9*9 square inches
The circumference of a circle with an 18-inch diameter is about 56.55 inches. (C = d x Pi)
The area of a circle, if the diameter is 18 yards, is: 254.5 square yards.
Area of circle: 81*pi square feet
A circle with a diameter of 18 meters has an area of 254 square meters.