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Name
Рајко Велимировић
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May 12 2012 at 13:04
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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}) $
