If `A,A^t` are ends of major axis and `B,B^t` are ends of mijor axis of `S=(x^2)/9+(y^2)/4-1=0` then the eccentricity of ellipse touching `S=0` at `A,A^t` and having foci at `B,B^t` is (A) `1/3 sqrt5` (B) `2/3` (C) `2/sqrt5` (D) `2/sqrt13`

S and T are foci of an ellipse and B is an end of the minor axis , if STB is an equilateral triangle , the eccentricity of the ellipse , is

S and T are foci of an ellipse and B is an end of the minor axis , if STB is an equilateral triangle , the eccentricity of the ellipse , is

S and T are foci of an ellipse and B is an end of the minor axis , if STB is an equilateral triangle , the eccentricity of the ellipse , is

S and T are the foci of an ellipse and B is the end point of the minor axis. If STB is equilateral triangle, the eccentricity of the ellipse is

S and T are the foci of an ellipse and B is one end of the minor axis. IF STB is an equilateral traingle , then find the eccentricity of the ellipse.

A series of concentric ellipses E_1,E_2, E_3..., E_n are drawn such that E touches the extremities of the major axis of E_(n-1), and the foci of E_n coincide with the extremities of minor axis of E_(n-1) If the eccentricity of the ellipses is independent of n, then the value of the eccentricity, is (A) sqrt 5/3 (B) (sqrt 5-1)/2 (C) (sqrt 5 +1)/2 (D) 1/sqrt5

The eccentricity of ellipse, if the distance between the foci and L.R is same a. (sqrt(3))/2 b. 2/(sqrt(3)) c. 1/(sqrt(2)) d. (sqrt(5)-1)/2