How do I calculate the circumference of a n-sphere?

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I have a 4-dimensional sphere of radius r. From it, I can calculate the 3-dimensional surface area of the hypersphere using the formula 2pi^2r^3. I now need to calculate it's circumference, but I'm not allowed to use the radius, I have to use the surface area, which is, however, a 3d object, so I don't know which formula to use.