Approximately 86.7 units squared.
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The area of a circle that has a circumference of 18 is 25.78 inches squared.
The circumfrence is like a perimeter. It is the area around a circle. You can find the circumfrence of a circle by using this formula. Pi x R2 or Pi times the radius squared.
18.84
The circumference of a circle is (diameter) multiplied by (pi).
If you mean of a circle then they are as follows:- Circumference = 2*pi*radius or diameter*pi Area = pi*radius squared