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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. \(\frac 1 3\) | |