#geometry book

​​​The geometry book is finished. I’ve been working on this project on and off since 2013. It’s a Japanese Album moleskine, sometimes called an accordion-fold book, of about 50 leaves or panels.  At this point, both sides of every sheet of paper in the book are inked with 111 geometry problems in both diagram and text.  (technically, there’s space for about three more on the inside of the front…

[https://youtu.be/WcJ6nk6cxeI] Once you finish a book on geometry, everyone wants help. 🙂 I wound up making this short video on how to find the center of a circle for my dad.  It’s not ideal; I need a better set-up for making videos at my desk.  But the essence of it are these steps: On a given circle, find three points about 1/3 of the way around the circle, A, B, and C. Arc the distance AB…