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The area of a circle that has a circumference of 18 is 25.78 inches squared.
A circle with a radius of 18 inches has an area of 1,017.88 square inches.
The area of a circle whose diameter is 18 inches is: 254.5 square inches.
Using 3.14 as Pi the area of circle is: 254.34
Using 3.14 as Pi the area of circle is: 254.34