4 Jul
2019
4 Jul
'19
2:28 p.m.
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