i'm trying to put together a geometry class for a friend. does anyone have some favorite lessons / discoveries from geometry that they loved, at a beginning to intermediate level? basically hs / middle school geometry. i'm thinking of starting with some basic triangle proofs...
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oh how I wish online tools were as powerful / fluid as mathematica! really think more computer people should try it. access to metaphors and tools and integration that few products can match in power, sophistication, brevity and presentation. Manipulate[Plot[f(x),{x,0,n}]]
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