Euclid

Euclid is a short geometry primer that includes five of the most basic and well known topics of plane geometry: Lines and Angles, Parallel Lines, Triangles, the Pythagorean Theorem, and Rectangles.

The topics are presented in simple, clear, visual, informal terms; no attempt is made to be "mathematically rigorous." The emphasis is on practical use, enjoyment, and beauty.

Each topic presents simple theorems, diagrams and examples, and a self quiz. A final exam is offered at the end of "the course".

A primer that will change your mind about geometry ==> Euclid.