Question

In calculus, how do I know when to use the disk method, or when to use the cylinder method?

Answer 1

Well, it's a function of experience and trial-and-error, unfortunately.

If you set up your volume elements using each method, you can see (usually) which will be easier to integrate.

Answer 2

Like loki has said, it depends on the function's graph ^_^

Answer 3

Usually its one of the either that will make the problem simple i would imagine...tho you could use both for any problem, aslong as you set it to the correct respect of the y or x axis. Usually Disc is when your trying to solve for x-axis and shell for y-axis.

Answer 4

If you have 2 graphs, cylindrical shell is much easier ^_^

Answer 5

than the washer's method