Review Suggested Edit

How can you forebode that amount of wood in a napkin ring is the same, regardless of the size of the sphere used ?

Stewart, Clegg, Watson. *Calculus Early Transcendentals*, 2021, 9th edition. page 467. Problem 64.

![](https://i.imgur.com/6k9kHrx.jpeg)

When I attempted this question, I thought I miffed, because my answer lacked R and r! Even after seeing the solution, I still can’t intuit why the napkin ring’s volume is independent of R and r. Before attempting any paperwork, how can a student forefeel that the napkin ring’s volume shall be independent of R and r ?

![](https://i.imgur.com/a02inbr.jpeg)