I have a hard time determining when to use the washer method and using cylindrical shells when finding the volume of a solid. And when to start with Dy, Or Dx.
For Example: Find The Volume of the solid generated by revoling the region bounded by y = or the square root of x and the lines y = 2 and x = 0 about the:
A) the x- axis.
Would the washer method be more useful here?