Talk:Calculus/Volume of solids of revolution/Solutions

I don't think the suggested solution to exercise 3 (volume of cone with central hole via washer method) is correct. Namely, because the central hole eliminates the "point" of the cone, the upper end of the integration should be x=(R-r)h/R instead of the suggested x=h. As a result, the answer is quite a bit more messy. Maybe I am missing something as I am just learning this on my own. Davidstuartbruce (discuss • contribs) 18:03, 14 November 2013 (UTC)