"Informal notes" by Kevin Brown on geometry: constructing the heptadecagon, what mirrors do, the golden pentagon, the grazing goat and the lune, Napoleon's theorem, chess boards, Diophantine geodesic boxes, Zeno's mice...

The elementary concepts are explained, with a quick reference for other lessons that employ inversion geometry.

How do you solve a problem like solids, mathematically speaking? Well, you could use this rather fascinating resource provided by the Convergence magazine. Offered as an educational resource by the Mathematical...

The goal of Math Bits is to offer "fun, yet challenging, lessons and activities." The site was created by two mathematics educators intent on increasing the love of math. The resources provided here are divided into more...