Find the eccentricity of an ellipse if the disctance between its directrices is three times the distance between its foci.

Find the eccentricity of an ellipse if the distance between its directions is three times the distance between its foci.

Find the equation of an ellipse the distance between the foci is 8 units and the distance between the directrices is 18 units.

If the eccentricity of an ellipse is 5/8 and the distance between its foci is 10 , then find the latusrectum of the ellipse.

Find the eccentricity of an ellipse, if the length of its latus-rectum is one third of its minor axis.

Find the equation of ellipse in standard form if,: The distance between foci is 6 and the distance between directrices is 50/3

If the eccentricity of an ellipse be (1)/(sqrt2), then its latus rectum is equal to its

The distance between the directrices of the hyperabola x=8 sec theta, y =8 tan theta is-

The distance between two directrices of a rectangular hyperbola is 10 units. Find the distance between its foci.