Circumference of Ellipse
Hello.
Is there anyone to know a formula to determine the circumference of ellipse(x2/a2+y2/b2=1). Thanks in advance. 
Re: Circumference of Ellipse
have a look at http://forum.swarthmore.edu/dr.math/...q.ellipse.html

Re: Circumference of Ellipse
There is a neat approximation which has a maximum error of 0.4%. After Roger Maertens.
Perimeter = ((a^y+b^y)^(1/y))*4 where a,b = major/minor semi axis y = const = ln(2)/(ln(pi/2)) Hope that's helpful! Or you could always do a little numerical integration. dan 
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