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→Mathematics: Add bit on eccentricity
:<math>A = \pi ab</math>
:<math>A = \pi ab</math>
where ''a'' is the semi-major axis and ''b'' is the semi-minor axis.
where ''a'' is the semi-major axis and ''b'' is the semi-minor axis.
===Eccentricity===
The eccentricity, ''e'', of an ellipse can be computed from its semi-major and semi-minor axes as,<ref>{{cite web|url=https://mathworld.wolfram.com/Eccentricity.html|title=Eccentricity|accessdate=July 16, 2020|publisher=mathworld.wolfram.com}}</ref>
:<math>e = \sqrt{1 - \frac{b^2}{a^2}}</math>
Ellipses have eccentricites between 0≤''e''<1. A circle is a special case of an ellipse which has an eccentricity of zero.
==References==
==References==