Disc method: revolving around x- or y-axis

Let $R$R be the region in the first quadrant enclosed by the $x$x-axis, the $y$y-axis, the line $y=2$y, equals, 2, and the curve $y=\sqrt{9-x^2}$y, equals, square root of, 9, minus, x, squared, end square root.

A solid is generated by rotating $R$R about the $y$y-axis.