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Circumference of a 4-sphere

  1. Mar 2, 2013 #1
    What is the circumference of a four dimensional sphere?
  2. jcsd
  3. Mar 2, 2013 #2
    [itex]2\pi R[/itex], I guess.
  4. Mar 3, 2013 #3


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  5. Mar 11, 2013 #4
    Is it just coincedence that 2∏r × ∏r2 =2∏2r3
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