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(A) sphere is enclosed in a right circular cylinder such that it touches the top,bottom,and the curved surface of the cylinder.Since the sphere touche

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$2r$

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(A) sphere is enclosed in a right circular cylinder such that it touches the top,bottom,and the curved surface of the cylinder.Since the sphere touches the curved surface of the cylinder,the diameter of the sphere must be equal to the diameter of the cylinder.The radius of the cylinder is given as $r \, cm$,so the diameter of the cylinder is $2r \, cm$.Therefore,the diameter of the sphere is $2r \, cm$.

$A$ right circular cylinder of radius $r \, cm$ and height $h \, cm$ (where $h > 2r$) just encloses a sphere. What is the diameter of the sphere (in $cm$)?

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