• Big ideas
  • Plane shapes
    • Polygons
  • Congruence
    • Congruent triangles
  • Similarity
    • Similar triangles
  • Geometric proof
    • Convince me
  • Circle geometry
    • Angle and chord properties
• Misunderstandings
  • Classifying polygons
    • Is this a hexagon?
    • Pattern block hexagons
    • Hexagonal tangrams
  • Similar or congruent?
    • What is wrong with this proof?
    • Starting a congruence or similarity proof
    • Complete the congruence proof
  • The language of geometry
    • Geometric literacy
    • Tackling the terminology
    • Translating geometric descriptions
  • Revealing the invisible
    • An angle in the bend
    • Approaching a geometric problem
    • Adding auxilliary lines
    • More construction lines
• Good teaching
  • Exploring quadrilaterals
    • Properties of quadrilaterals
  • Exploring congruence
    • Developing the congruence tests
  • Looking beyond the lines
    • Visualising relationships
  • Writing a proof
    • Proving Pythagoras' theorem
  • Exploring circles
    • Explore, predict, confirm
• Assessment
  • Assessment approaches
    • Practical tasks
    • Working collaboratively
    • Pen and paper
    • Creative construction
  • Assessment design
    • Changing direction
    • Literacy questions
    • Find the error
    • Geometry games
• Activities
  • Adding auxilliary lines
  • Circle geometry investigations
  • Complete the congruence proof
  • Dissected proof
  • Dynamic circle geometry
  • Geometry toolkit
  • Great angle chase
  • Hexagonal tangrams
  • Linking angles
  • Paper, pencil and protractor
  • Pattern block hexagons
  • Property match-up
  • Quadrilateral flowchart puzzle
  • Quadrilateral property quiz
  • Translating geometric descriptions
  • Virtual congruence
• Downloads
• Acknowledgements