A plane through a right angle cone. The circle is a special case of the ellipse, an ellipse with an eccentricity of zero.

The equation of an ellipse is given by


This may be approximated as


The eccentricity e of an ellipse can be computed by the formula:

where: a is the semimajor axis and b is the semiminor axis.

Linear Eccentricity

The ratio of the distance between the center and focus of an ellipse to its semimajor axis.

See also: Circle, Conic Section, Eccentricity, Ellipsoid, Focal Radius, Latus Rectum, Oblate Spheroid.

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Subjects: Mathematics