원주율

      p = 3.14159265358979323846264338327950... 

       

       

      원(圓)

       

      r = radius

      d = diameter

      C = Circumference

      p = C/d = 3.14...

       

      C = pd

       

      A = pr2

       

      구(球) sphere

       

      V=4/3×pr3

      A = 4pr2=d2p

       

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