I. Disk Method
A. Use the Disk Method if
(1) the function is in terms of x and rotation is about the x-axis
or (2) the function is in terms of y and rotation is about the y-axis
II. Shell Method
A. Use the Shell Method if
(1) the function is in terms of x and rotation is about the y-axis
or (2) the function is in terms of y and rotation is about the x-axis
