the plane $x + y = 4$ and the cylinder $y^2 + 4z^2 = 16$. $0 < x \le 4 - y$, $0 \le y \le \sqrt{16 - 4z^2}$, $0 \le z \le 2$
(9) Find the volume of the right circular cylinder whose base is the circle $r = 2 \sin \theta$
in the $xy$-plane and whose top lies in the plane $z = 4 - y$.
(10) Find the volume of the solid right cylinder whose base is the region between the
