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In a ellipse, its foci and the ends of its major axis are equally spaced, if the length its semi-minor axis is $2 \sqrt{2}$, then the length of its semi-major axis is :
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3
$A S^{\prime}=S S^{\prime}=S B$ $\Rightarrow e=1 / 3$ $\Rightarrow a=3$
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