Using 3.14 as Pi the area of circle is: 254.34
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The area of a circle whose diameter is 18 inches is: 254.5 square inches.
The radius is 9 inches because area of circle is pi*9 squared = 81pi square inches and the diameter is twice the radius which is 2*9 = 18 inches
The circumference of a circle with a diameter of 18 inches is 56.5 inches.
18 inches
A circle with a radius of 18 inches has a circumference of 113.097 inches.