4 Jul
2019
4 Jul
'19
8:36 a.m.
My guess is that she used a marked thread. Make 12 marks on this thread using a ruler, put it down on the field to make a circle with the help of this plate here - done! --Ed Pegg On Thursday, July 4, 2019, 09:28:24 AM CDT, Elkies, Noam <elkies@math.harvard.edu> wrote: Possibly she used origami, or had some other kind of angle trisector? Wikipedia's "Tridecagon" entry gives this link to Gleason's Monthly article on the topic; see pages 192-193. https://web.archive.org/web/20151219180208/http://apollonius.math.nthu.edu.t... NDE _______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun