Another diagram from the book Quadrivium (page 79). This one is called the Sand Reckoner's diagram, it can be used to divide a square's edge into 3, 4, 5, 7 and 11.

Here's a link to the book: https://amzn.to/3Q4tgoZ

Geometric art tutorials: https://geometerscircle.com/?video=4cG9RahEpvM
My newsletter: https://zkorvin.com
Tools I use: https://zkorvin.com/tools

Chapters:
00:00 Three
04:29 Five
05:53 Four
07:59 Seven
12:49 Eleven

This video was made possible thanks to all the awesome members of the Geometers Circle. Thank you!