• Matrix Transformations in GeoGebra

    by  • August 6, 2013 • 1 Comment

    Last weekend I had the great pleasure of learning about matrix transformations in GeoGebra from the incomparable Todd Edwards! He was one of the organizers, along with Steve Phelps, of the 2013 North American GeoGebra Conference, held on the beautiful Miami University campus, in Oxford, OH. (I’ll write more about that soon.) I attended...

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    Revisiting London & the Golden Ratio

    by  • July 30, 2013 • 0 Comments

    I have been revisiting these topics as a launch to trigonometry, and I am once again amazed. Two years ago, in London, I stayed in a hotel designed around Fibonacci Numbers and the Golden Ratio. The reception staff did not quite understand the math (though Francesca and Antonio were charming “hosts”), so, upon my...

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    How We Roll

    by  • July 30, 2013 • 0 Comments

    I had the privilege of working with five motivated and thoughtful teachers this week who will be teaching our Geometry21 course this year. I had about six hours to show them what this course is all about and make them understand what blended learning looks and feels like. I think it will be a...

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    A New Way to Build a Geometric System

    by  • July 17, 2013 • 0 Comments

    This is a quick preview, I will expand upon it when I can. Here is the outline of another approach to the beginning of Geometry, where each major step can be observed through software or manipulatives, since they are visually obvious, or demonstrated through coordinate geometry. Some must be postulates, others can then be...

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