Using shells, which is easiest because washers would mean we have to solve for x.
I'm having trouble visualizing and putting together this concept.
Question: Find volume of solid generated by revolving the region bounded by and about the line
So I want to use vertical cylindrical shells to find the volume. I know the general formula for a cylindrical volume is V=circumference x height x thickness. So i know it should be for circumference and for thickness. But i dont see hows its for height.