Volume 4. Use cross sectional disks to find the volume of the solid obtained by revolving the region bound between = 2, y = 1, and y = 2 7 around the line y = 0. The bound region 1s shown below as a starting point. 5. Take a ball of radius R, then bore a cylindrical hole of radius r through the central axis of the ball. The result is a ball with a hole through it. Use cross sectional disks to find the volume of the obtained solid. il I= formormdenpmitiomn e R 6. Use cylindrical shells to find the volume of the solid obtained by revolving the region bound between y = x + 3 and y = 3 + 22 22 around the line = = 0. 7. Use cylindrical shells to find the volume of the solid obtained by revolving the region bound between y = 2* and 2 = y* around the line y = 1