david_berger

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  • Rectangle, Rhombus, Square
    Activity

    Rectangle, Rhombus, Square

    david_berger

  • Vertical Angles and Linear Pairs
    Activity

    Vertical Angles and Linear Pairs

    david_berger

  • Slope Explorations
    Activity

    Slope Explorations

    david_berger

  • Optical Illusion #2
    Activity

    Optical Illusion #2

    david_berger

david_berger's favorite resources

  • Proportions in similar triangles
    Activity

    Proportions in similar triangles

    GeoGebra Materials Team

  • 3.5 Investigation: Proportional Sides
    Activity

    3.5 Investigation: Proportional Sides

    Brian Streight