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Exploring trigonometry with the Geometer’s Sketchpad

Shaffer, D. W. (1995). Exploring trigonometry with the Geometer’s Sketchpad. Berkeley: Key Curriculum Press.

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Symmetric Intuitions: Dynamic Geometry/Dynamic Art

Shaffer, D. W. (1995). Symmetric Intuitions: Dynamic Geometry/Dynamic Art. Symmetry: Culture and Science, 6(3), 476-479. http://epistemicgames.org/cv/papers/SymmetricIntuitions95.pdf

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