18 inches
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Circumference of a circle: 2*pi*radius or diameter*pi
It looks like an extra large pizza which has a diameter of 18 inches
All depends what you mean by 18 inches, is that the circumference, the diameter or the radius
There are 100*pi square inches in a 20 inch diameter circle
The radius of a circle is half the diameter, so the radius of a 6 inch diameter circle is 3 in.