directrix: Ib kab siv los tsim thiab txhais ib qho conic seem; ib tug parabola muaj ib tug directrix; ellipses thiab hyperbolas have two (plural: directrices).
Directrix ntawm lub ellipse yog dab tsi?
Ob txoj kab sib npaug ntawm sab nraud ntawm lub voj voog ncig mus rau qhov loj axis. Directrics tuaj yeem siv los txhais qhov ellipse.
Puas muaj Directrix rau ellipse?
Zoo li hyperbolas, cov ellipses uas tsis yog ib puag ncig muaj ob qhov sib txawv foci thiab ob qhov cuam tshuam ncaj qha, txhua ntu conic directrix yog perpendicular rau cov kab koom nrog ob foci (Eves 1965, p. 275). Qhov eccentricity tuaj yeem txhais tau tias yog txoj haujlwm ntawm kev tsom xam raws li ib feem ntawm lub semimajor axis.
Ntau npaum li cas Directrix puas muaj lub ellipse?
directrix: Ib kab siv los tsim thiab txhais ib qho conic seem; ib tug parabola muaj ib tug directrix; ellipses thiab hyperbolas muaj ob(plural: directrices).
Directrix ntawm ellipse yog dab tsi?
Yog ib lub ellipse muaj qhov chaw (0, 0), eccentricity e thiab ib nrab loj axis a nyob rau hauv x-direction, ces nws foci nyob ntawm (±ae, 0) thiab nws cov directrices yog x=±a/e.
