Geometry Course -- Open Reference: Free online self-paced interactive manipulative graphic animation tools accompanying excellent concise lessons of an entire Geometry "Textbook" course ...

http://www.mathopenref.com/index.html


Plane Geometry and Coordinate Geometry Courses and a General Mathematics Interactive Manipulative

Graphing Animation Tool, etc. Awesome: Simply Structured and Profound...


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Updated January 2015: He now has added Solid Geometry and Calculus... The guy is very dedicated (read the Introduction

to the new calculus section).

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Updated December 24, 2015: A great free example about "Google Logo and the Golden Ratio in Design" by Gary Meisner

http://www.goldennumber.net/category/design/