文件:Ellipse Properties.svg

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Cī-siŏh-bĭh ùng-giông téng Wikimedia Commons lì, bĕng-chiā ô kō̤-nèng ké̤ṳk gì-tă cuŏng-áng sāi. Â-dā̤ sê cī-bĭh ùng-giông găk ùng-giông mièu-sŭk hiĕk-miêng gì mièu-sŭk nô̤i-ṳ̀ng.

Mièu-sŭk
English: A diagram showing some basic properties of an ellipse, including
  • The distance to a focus, F, from the centre C, is the eccentricity, e multiplied by the semimajor axis, a.
  • The distance from one focus to the other via any point on the ellipse, P, is always 2a.
  • The distance from a point, P, on the ellipse to a focus is always proportional to the distance to a vertical line, D, called the directrix. The constant of proportionality is the eccentricity, e.
  • The eccentricity is always between 0 and 1. At zero, the ellispe becomes a circle, at 1 the ellipse becomes a parabola. Greater than one, it is a hyperbola.
Nĭk-gĭ 2008年Sĕk-nê-nguŏk8日 (上傳日期)
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8 12 2008

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