A right circular cylinder with radius 2 is inscribed in a hemisphere with radius 5 so that its bases are parallel to the base of the hemisphere.  What is the height of this cylinder?
Question:
A right circular cylinder with radius 2 is inscribed in a hemisphere with radius 5 so that its bases are parallel to the base of the hemisphere.  What is the height of this cylinder?
Answer:
Let's think step by step.

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\sqrt{21}
A right circular cylinder with radius 2 is inscribed in a hemisphere with radius 5 so that its bases are parallel to the base of the hemisphere.  What is the height of this cylinder?
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