BOB on Applications of Integrals

At first I thought this unit was going to be quite easy going, but to my surprise, or my demise it became quite confusing and difficult.

We started out by just finding simple distance and displacement given a specific scenario or problem, sure this was easy but then we moved to revolving 2d graphs.

In my opinion these graphs have no business revolving whatsoever. This was just confusing. We revolved these graphs on various points all over the plane, and certain points caused the shape to be a washer or cylindrical shell which required a few more calculations.

Good luck on the test everyone. I'm off to bed.