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Ełise

In giometria, a existe tre maniere almanco par definir łe ełisi.

  • Una ełise xe una de łe sesion còneghe.
  • Łe sia F e F′ do ponti del pian, e sia d na łongitudine pi granda de ła distansa intrà F y F′.
Ła ełise de foghi F, F′ e de paràmetro d xe el łogo giometrico de i ponti del piano tal che ła soma de le distanse M xe costante e uguałe a d:
  • Inte un sistema de coordenade ortonormałi, na ełixe xe definida da ła ecuasion:
indove che a > 0 y b > 0 i xe i semiasi, b cuel de łe ordenade. L'origine O xe ła metà del segmento [FF′].
  • Ła distansa intrà i do foghi FF′ se ciama distansa focal e ła xe 2c= 2ea esndo e ła esentrisita e el semiase pi grando.
Semiłato reto
Semiłato reto
Controło de autoritàLCCN (ENsh85042604 · GND (DE4194779-4 · BNF (FRcb11981967h (data)

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