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seen May 12 '12 at 13:04
my formula elliptic integrals!: $C=2\pi( \frac{\sum_{i=1}^n \sqrt{a^2sin^2_\alpha\,\!i+ b^2cos^2_\alpha\,\!i } }{n} )$ :sin,cos -deg: $\alpha\,\!i=( \frac{2i-1}{n} ).45$ : division number n is defined by the formula: $\pi=4.n.\sin(\frac{45}{n}) $