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Pi square?

  1. Oct 24, 2004 #1

    arivero

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    Is there any geometric figure whose calculation (area, perimeter, ...) involves the terms pi^2 or (pi^2-1) ?
     
  2. jcsd
  3. Oct 24, 2004 #2

    HallsofIvy

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    I thought it was pretty well known that the area of a circle of radius r is
    [tex]\pi r^2[/tex]?
     
  4. Oct 24, 2004 #3

    arildno

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    Sure, check up the torus..
    The surface area of a torus with big radius R and small radius r has surface area:
    [tex]A=4\pi^{2}Rr (r<R)[/tex]
     
  5. Oct 24, 2004 #4

    robphy

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