# Circumference of Ellipse

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 August 16, 2000, 05:01 Circumference of Ellipse #1 Q.Ronnie Guest   Posts: n/a Hello. Is there anyone to know a formula to determine the circumference of ellipse(x2/a2+y2/b2=1). Thanks in advance.

 August 16, 2000, 06:01 Re: Circumference of Ellipse #2 E.Buchanan Guest   Posts: n/a have a look at http://forum.swarthmore.edu/dr.math/...q.ellipse.html

 August 24, 2000, 06:56 Re: Circumference of Ellipse #3 Daniel Jaeggi Guest   Posts: n/a 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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