Euclid

Euclid is a short geometry primer that includes five of the most basic and well known principles 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 includes a self quiz and a final exam is offered at the end of "the course".

Euclid is an apps project of Ms Math Master that includes elementary lesson drills and simple puzzles.