1.

If S and S' are foci of the ellipse \(\frac {x^2}{a^2} + \frac {y^2}{b^2} = 1,\) B is the end of the minor axis and BSS' is an equilateral triangle, then the eccentricity of the ellipse is

A. \(\frac 1 2\)
B. \(\frac 1 3\)
C. \(\frac 1 4\)
D. \(\frac 1 5\)
Answer» B. \(\frac 1 3\)


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