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C/d as constant

  1. Aug 20, 2014 #1
    Lets say that "d" is diametr of a circly,and C is the perimetr(length).
    Why C/d = pi (3.14) is a constant?? I know the proof of archimides with poligons,from which found the value of pi,but how we know that C/d is always equal with a constant that we named as π=3.14;

    Thanks !!!
  2. jcsd
  3. Aug 20, 2014 #2
    I found it guys. The proof use similar triangles etc....
    Thanks for your time !!!
  4. Aug 25, 2014 #3
    This also requires assumptions of Euclidean geometry. In spherical geometry it is not constant.
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