All sections generated by performing transversal cuts to a right cone.
The geometric space that is equidistant from a line called the directrix and a point of a parpendicular to this calle the focus.
The abolute value sum of the distances from two fixed points called focii and a geometric space for which this sum remains constant.
The absolute value difference of two points called focii and a a geometric space for which this difference remains constant.
A geometric space that is equidistant from a point called center.
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