More geometric theorems

We added the following geometric constructions and theorems.  They are collected under the new title “Origami Geometry.”

Euler line

Simson’s theorem

Nine-point-circle

Meneraus’s Theorem

Ceva’s Theorem

Steiner-Lehmus Theorem

Supplement is revised

Since some readers may find it difficult to register themselves, I added an explanation of how to get to the Register page. To read the revised supplement, you may need to clear the cache of your browser.

TI