The volume of a cylinder of radius r i...

The volume of a cylinder of radius `r` is `1/4` of the volume of a rectangular box with a square base of side length `xdot` If the cylinder and the box have equal heights, what is `r` in terms of `x ?` (a) `(x^2)/(2pi)` (b) `x/(2sqrt(pi))` (c) `(sqrt(2x))/pi` (d) `pi/(2sqrt(x))`

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