If the distance between the directrices is thrice the distance between the foci, then find eccentricity of the ellipse.

The distance between the directrices fo an ellipse is four times the distance between their foci. Then the ecentricity fo the ellipse is

If the distance between the foci is 2 and the distance between the directrices is 5 , then the equation of the ellipse is

If (distance between directrices ) = 3 (distance between foci) , then e =

In an ellipse the distance between the foci is 8 and the distance between directrices is 25. then find the length of the major axis.

If the distance between foci of a hyperbola is twice the distance between its directrices, then the eccentricity of conjugate hyperbola is :

If the distance between foci of a hyperbola is twice the distance between its directrices, then the eccentricity of conjugate hyperbola is :

If the distance between foci of a hyperbola is twice the distance between its directrices, then the eccentricity of conjugate hyperbola is :

In an ellipse, the distance between its directrices is four times the distance between its foci. If (-2, 0) is one of its vertices, then the equation of the ellipse is

If the length of the minor axis of an ellipse is equal to half of the distance between the foci then the eccentricity of the ellipse is

Find the length of the latus rectum of the ellipse if the eccentricity is (1)/(2) and the distance between the foci and the centre of the ellipseis 4.