Top Drawer Teachers. Resources for teachers of mathematics
  • Home
  • Fractions
  • Geometric reasoning
  • Mental computation
  • Patterns
  • Reasoning
  • Statistics
  • 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

Home > Geometric reasoning > Misunderstandings

Site map

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

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