This page might end up also containing other school maths resources, but so far it only contains one: an incomplete pdf ebook called “Deep thoughts on Area.” Remember all the area formulae you were given in primary school and early high school? In many school districts they are never proved. This books proves them. Some of the results that look quite simple to apply turn out to be surprisingly difficult to prove beyond reasonable doubt.
Download the Book. Version 3.0 released on 8-Apr-2024
The book is free of charge in most non-commercial settings, but with the request that wealthy users make an appropriate donation to the nominated charity. See the license within the book for full details. Currently the nominated charity is Sexual Health and Family Planning ACT. There is also more information about why I chose this charity.