李英

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  • Carvão Quadrilateral
    Activity

    Carvão Quadrilateral

    John Golden

  • Disk Pyramid Puzzle
    Activity

    Disk Pyramid Puzzle

    Duane Habecker

  • Graphing Calculator Tutorials
    Book

    Graphing Calculator Tutorials

    GeoGebra Docu Team

  • Steiner's Porism
    Activity

    Steiner's Porism

    Michael Borcherds