How do you find the volume of a solid of revolution washer method?

1 Answer
Aug 30, 2014

Suppose that f(x)geq g(x)f(x)g(x) for all xx in [a,b][a,b]. If the region between the graphs of ff and gg from x=ax=a to x=bx=b is revolved about the xx-axis, then the volume of the resulting solid can be found by
V=pi int_a^b{[f(x)]^2-[g(x)]^2}dxV=πba{[f(x)]2[g(x)]2}dx