On Thursday, October 5, 2017 at 4:23:14 PM UTC-4, Jan wrote: > On Thursday, October 5, 2017 at 1:11:12 PM UTC-7, Dan Christensen wrote: > > On Thursday, October 5, 2017 at 12:38:55 PM UTC-4, Archimedes Plutonium wrote: > > > Alright, if our knife in Conic and Cylinder... > > > > Archie, for $52.49, you can save yourself all this embarrassment. Order the "Conic Sections Model" made of transparent plastic. See for yourself -- no knives or scissors required -- that at an ellipse is indeed a conic section. > > > > http://www.eaieducation.com/Product/520610/Conic_Sections_Model.aspx > > > > If you can't afford it, maybe we can take up a collection for you. > > Maybe Google Sketch would be good for him to play with? It's free: > https://www.sketchup.com/ >
Probably too complicated for Archie. He seems to be a more of a hands-on kind of guy.