l / r = 1 - e * cos(A) {polar equation}, where l is latus-rectum length divided by two, r is distance from pole or focus, e is eccentricity, and A is polar angle. Transverse or major-axis positive direction is reference line {initial line} {polar axis, conic}.
Mathematical Sciences>Geometry>Solid>Cone>Conic Section>Eccentricity
3-Geometry-Solid-Cone-Conic Section-Eccentricity
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Date Modified: 2022.0224