Here are my slides on the construction of the heptakaidecagon. I have referred to them before, as detailed below, but I have edited them (slightly) since, and I wanted to have a fixed home for them. That will be this post.
I call them slides, because the page size is A6, in landscape orientation, and most pages are self-contained, except for the six pages of the Introduction. There are 80 pages, all told, last edited June 13 of this year (2026). A circle is divided into seventeen equal arcs, with ruler and compass alone, and then a proof that the circle has been so divided is given in Euclidean terms.
One purpose then is to contemplate why the Ancients did not discover the construction.
Some polygons in three dimensions:
Unused supports for beach umbrellas
Thursday, June 4, 2026
(All photos on this page from Altınova, Ayvalık, Balıkesir, Turkey)









