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

If the distance between the directrices of a rectangular hyperbola is 10 unit, then the distance between its foci is-

If the distance between two directrices of a rectangular hyperbola is 15, then the distance between its foci in units is:

The distance between the directrices of the hyperbola x^(2)-y^(2)=4 is

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

The distance between the vertices of a hyperbola is half the distance between its foci and the length of its semi-conjugate axis is 6. Referred to its axes of coordinates, find the equation of the hyperbola.

The distance between the directrices of the hyperbola x=8sectheta,y=8tantheta , is

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