Discussion
A right circular cylinder of radius r cm and height h cm (h > 2r) just encloses a sphere of diameter
Answer: B
For the sphere to be enclosed snugly, it must touch the curved wall all the way round, so its radius equals the cylinder's radius \( r \).
\[ \text{diameter of sphere} = 2r \]
The condition \( h > 2r \) simply guarantees the cylinder is tall enough to contain that sphere; the height itself never limits the fit, so it does not appear in the answer.
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