I’m just finishing up my last math class towards my degree, and we’ve stumbled into the realm of basic Geometry. For the first time I was taught to really look at the shapes and what area and volume mean when you apply them to the shape. Most of our formulas are based off of the rectangle, in addition to whatever is going on with that shape. For example: a cylinder is just a rolled up rectangle with two circles for the top and bottom.
This site takes Geometry of all forms and teaches you how to think about it, what its history is, and how to use it mathematically.
Historically it covers: the advent of the compass, it explores the golden ratio, and even delves into the geometry of origami.
You’ll find tons to learn hear about Geometry, there are even some open ended problems for you to explore on your own. It certainly gave me food for thought as I studied for my final exam.