Setting the expression $2\pi r$ for the circumference of the circle equal to $8\pi$ and dividing by $2\pi$, we find that the radius of the circle is $r=4$.  The area of the circle is $\pi r^2=\pi(4)^2=\boxed{16\pi}$ square units.
What is the area, in square units, of a circle with a circumference of $8\pi$ units? Express your answer in terms of $\pi$.
{'answer': '16\\pi', 'subject': 'Prealgebra', 'level': 3, 'unique_id': 'test/prealgebra/1240.json'}