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I'm finding myself stuck on what is probably a simple question, but I believe I am taking the wrong approach.

The section is "Volumes with infinite integrals," and the chapter is "Improper Integrals."

The question, "Use calculus to find the circumference of a circle with radius a."

I've looked at this from the approach of integrating the circle equation in the arc length formula, but I don't think it's looking for a proof like that. Somehow this question should have an integral with infinity in it's limit.

A shove in the right direction would be greatly appreciated.

Thanks again, everyone.

Mac