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{{latinitas}}
'''Circumferentia''' est [[linea (mathematica)|linea geometrica]] quae per figuram sive curvam clausam circumfertur.
Circumferentia circuli calculata cum hac formula est:
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:: <math>c = 4aE(e)</math>
ubi circumferentia c, longitudo axis semi-maioris a, eccentricitas [[ellipsis]] e, et completa functio elliptica integralis generis secundi[https://en.wikipedia.org/wiki/Elliptic_integral#Complete_elliptic_integral_of_the_second_kind] E
Aequatio circuli in [[geometria analytica]] est:
::<math>(x-h)^2 + (y-k)^2=r^2 \,</math>
ubi ''(h,k)'' centrum et ''r'' [[radius (geometria)|radius]] circuli est.
{{figurae geometriae}}
{{NexInt}}
*[[Numerus pi]]
== Nexus externi ==
* [http://mathworld.wolfram.com/Circumference.html De circumferentia] in encyclopaedia Wolfram MathWorld {{ling|Anglice}}
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