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Healey Lee

  • deductive geometry

    Activity

    Healey Lee

  • DSE2012

    Activity

    Healey Lee

  • Untitled

    Activity

    Healey Lee

  • Area of rectangular field (2)

    Activity

    Healey Lee

  • Area of rectangular field

    Activity

    Healey Lee

  • dividing a squared cake for five children

    Activity

    Healey Lee

  • Butterfly theorem

    Activity

    Healey Lee

  • Divide it into 5 equal parts

    Activity

    Healey Lee

  • Geometry Exercises

    Book

    Healey Lee

  • Geometry problem (2)

    Activity

    Healey Lee

  • two Angle bisectors of same length?

    Activity

    Healey Lee

  • Geometry problem (1)

    Activity

    Healey Lee

  • Use area of triangles to prove cosine formula

    Activity

    Healey Lee

  • Fun question(2)

    Activity

    Healey Lee

  • Fun question (1)

    Activity

    Healey Lee

  • Testing

    Book

    Healey Lee

  • Statistics (M1)

    Book

    Healey Lee

  • Exploring the changes in mean and median

    Activity

    Healey Lee

  • Making Graph paper

    Activity

    Healey Lee

  • Probability animation

    Activity

    Healey Lee

  • Form 5 Mathematics

    Book

    Healey Lee

  • Equal chords and their distances from the centre

    Activity

    Healey Lee

  • Relationships between chords and their distances from centre

    Activity

    Healey Lee

  • Problem 1

    Activity

    Healey Lee