http://www.mathopenref.com/index.html
The Mission of the Math Open Reference Project is simple:
A free interactive math textbook on the web.
Using interactive tools and compelling animations, Math Open Reference provides an engaging way to learn and explore mathematics. Teachers will have new ways to teach, and the students a new way to learn that is fun and engaging.
Topics include: Plane Geometry, Coordinate Geometry, Solid Geometry, Trigonometry, Several Tools (Function explorer), Scientific calculator, and much more!
Great Extra: Step - by - step instructions for more than 30 different constructions
The Quadratic Function explorer (one of hundreds of interactive applets)
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