In a certain ellipse, the center is at $(-3,1),$ one focus is at $(-3,0),$ and one endpoint of a semi-major axis is at $(-3,3).$  Find the semi-minor axis of the ellipse.
Question:
In a certain ellipse, the center is at $(-3,1),$ one focus is at $(-3,0),$ and one endpoint of a semi-major axis is at $(-3,3).$  Find the semi-minor axis of the ellipse.
Answer:
Let's think step by step.

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\sqrt{3}
In a certain ellipse, the center is at $(-3,1),$ one focus is at $(-3,0),$ and one endpoint of a semi-major axis is at $(-3,3).$  Find the semi-minor axis of the ellipse.
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