Post #2712475

@divbyzero@mathstodon.xyz oh! I should have scrolled down farther. Then I’ll spoil it and add that what I liked about it is that knowledge that it’s a brain-teaser can help you solve it. It’s not really a brain teaser unless the solution is interesting since Martin Gardner probably isn’t going to lob calculus questions at you, so we can guess that the solution is constant, and if there’s no dependence on the particular geometry, the hole might as well have radius zero, leaving a sphere, which trivially has volume 36pi, which happens to be correct in general!