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

In an ellipse (x^(2))/(a^(2))+(y^(2))/(b^(2))=1 if the distance between the directrix is 3 times the distance between the foci, then the eccentricity is

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

Sarcomere is distance between-

The distance between 2 strands of DNA is

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

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

The distance between the Earth and the Moon is

What is the distance between the biggest chord and the centre ?

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