Tutorial Exercise Consider the solid obtained by rotating the region bounded by the given curves about the x-axis. y =4-4r', y = 0 Find the volume V of this solid. Part 1 of 5 When y = 4 - 4x2 is rotated around the x-axis, a vertical strip of width Ax creates a disk. The radius of this disk is r = 4-4x2 y = 4 - 4x2 o y-0 Part 2 of 5 The cross-sectional area of a disk of radius r is A = 4 - 4x X Since our disk has radius r = 4 - 4x2, then the cross-sectional area is A = n(4 -4x ) X