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Find the surface-area-to-volume ratio of a right circular cylinder. (Hint: For a right circular cylinder, S
\[2 \pi r^2+ 2 \pi r h\]= surface area
\[\frac{ 2 \pi r^2+ 2 \pi r h }{ \pi r^2 h }= \frac{ 2 \pi r(r+h) }{ \pi r^2 h }=\frac{2( r+h )}{ rh}\]