25.78310078 or about 26 square units
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The area of a circle that has a circumference of 18 is 25.78 inches squared.
The circumference is about 15.04 feet.
circumference = pi*18 cm area = pi*92 square cm
The circumference of a circle with a diameter of 18 inches is 56.5 inches.
If the circumference of a circle is 6.28 then its area is about 3.138 square units