A simple guide on how to show the volume of a cone is ⅓ height × πr² aimed at children aged between 11 and 14. ... then use the scissors to cut along the line. Image caption, ...

This article was originally published with the title “ How to Cut a Piece of Leather which will Exactly fit a Cone Drum ” in Scientific American Magazine Vol. 13 No. 36 (May 1858), p. 286 doi ...