- #1
paintednails
- 1
- 0
kepler's law!
hi, does anybody know how to prove that the eccentricity multiplied by the directrix is equal to [itex] \frac {b^2}{a} [\itex]?
i found that the eccentricity of an ellipse is equal to c/a.
i also found that the directrix is equal to a/e. the way i see it, if i multiply e and d, then i get
ed = a
but how do i prove that a = b^2 / a ?
please help, thanks <3
hi, does anybody know how to prove that the eccentricity multiplied by the directrix is equal to [itex] \frac {b^2}{a} [\itex]?
i found that the eccentricity of an ellipse is equal to c/a.
i also found that the directrix is equal to a/e. the way i see it, if i multiply e and d, then i get
ed = a
but how do i prove that a = b^2 / a ?
please help, thanks <3