Can a 4-Sphere Have a Circumference?

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What is the circumference of a four dimensional sphere?
 
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2\pi R, I guess.
 
http://www.sjsu.edu/faculty/watkins/ndim.htm

2π2R3 is surface area.
 
Is it just coincedence that 2∏r × ∏r2 =2∏2r3
 

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