Nyob rau hauv daim ntawv ntawm ellipse?

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Nyob rau hauv daim ntawv ntawm ellipse?
Nyob rau hauv daim ntawv ntawm ellipse?

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Video: Nyob rau hauv daim ntawv ntawm ellipse?
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Anonim

Kev sib npaug ntawm ib qho ellipse sau rau hauv daim ntawv (x−h)2a2+(y−k)2b2=1. Qhov chaw yog (h, k) thiab qhov loj ntawm a thiab b yog lub vojvoog loj thiab qhov me me yog lub vojvoog me.

Dab tsi yog qhov sib npaug ntawm ellipse?

Kev sib npaug ntawm cov ellipse yog muab raws li, x2a2 + y2b2=1 x 2 a 2 + y 2 b 2=1, qhov twg, qhov ntev ntawm ib nrab loj axis thiab b yog qhov ntev ntawm ib nrab axis.

Vim li cas qhov sib npaug ntawm ib lub ellipse sib npaug li 1?

Ib qho kev sib npaug, hauv daim ntawv conics, yog ib txwm "=1" Nco ntsoov tias, hauv ob qhov sib npaug saum toj no, h ib txwm nyob nrog x thiab k ib txwm nyob nrog cov y. … Qhov no qhia peb tias tus nqi ntawm e rau qhov tseeb (tsis yog lub voj voog) ellipse ib txwm yuav ntau dua 0. Muab qhov no ua ke, peb pom tias 0 < e < 1 rau ib qho ellipse.

Dab tsi yog qhov ntawm lub ntsej muag?

Txhua hom ellipse muaj cov ntsiab lus tseem ceeb:

  • Center. Lub ntsiab lus nyob rau hauv nruab nrab ntawm lub ellipse yog hu ua qhov chaw thiab muaj npe (h, v) ib yam li lub vertex ntawm ib tug parabola thiab qhov chaw ntawm lub voj voog.
  • Mas axis. Lub axis loj yog txoj kab uas khiav los ntawm qhov nruab nrab ntawm lub ellipse txoj kev ntev. …
  • Me ntsis axis. …
  • Foci.

Ib nrab lub voj voog hu ua dab tsi?

Ib ellipse is a half an ellipse.

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