# Conic section (polar system and one focus on the pole and the other somewhere on the 0° ray )

## Description

conic section (or just conic) is a curve obtained as the intersection of a cone (more precisely, a right circular conical surface) with a plane. A conic section with one focus on the pole and the other somewhere on the 0° ray (so that the conic’s major axis lies along the polar axis) is given by a polar equation.

Related formulas## Variables

r | Radius ( radial coordinate) (dimensionless) |

l | Semi-latus rectum (the perpendicular distance at a focus from the major axis to the curve (dimensionless) |

e | Eccentricity (dimensionless) |

ϕ | Angle (angular coordinate) (dimensionless) |

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