The curve is given by the equation $y = \sqrt{8x - x^2}$.
(i)[4]
Determine an expression for $\frac{dy}{dx}$, together with the coordinates of the stationary point on the curve.
(ii)[4]
Find the volume created when the region bounded by the curve and the $x$-axis is turned through $360^{\circ}$ about the $x$-axis.
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