Neither because the circumference of a circle is a measurement of length
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the area can not be cubed. the area is always squared. volume is cubed. the formula for area is pie multiplied by radius squared. your formula for your circle is... A = 121pi in2 the radius in your circle is 11 inches the formula for circumference is two times pi times the radius C = 2 * (3.14159) * 11 your answer is 69.11498in
Whenever you are answering volume questions, it's always units cubed (^3).
It is cubed.
The volume is cubed and the surface area is squared.
I'm pretty sure that perimeter is squared and volume is cubed.