Top Drawer Teachers: Geometry

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This collection of applets can be used to investigate circle geometry theorems. Top Drawer Teachers is a project of The Australian Association of Mathematics Teachers (AAMT) Inc. http://topdrawer.aamt.edu.au


  • 1. Properties of Chords and Angles
  • 2. Lines from the Centre
  • 3. Angles at the Centre and Circumference
  • 4. The Angle in a Semi-Circle
  • 5. Angles in the Same Segment
  • 6. Angles of Cyclic Quadrilaterals
  • 7. Tests for Cyclic Quadrilaterals (1)
  • 8. Tests for Cyclic Quadrilaterals (2)
  • 9. Tests for Cyclic Quadrilaterals (3)
  • 10. The Angle Between a Tangent and a Radius
  • 11. Tangents from an External Point
  • 12. The Angle Between a Tangent and a Chord
  • 13. Intersecting Circles
  • 14. Intersecting Chords
  • 15. Tangents and Secants
  • 16. The Angle Sum of a Triangle
  • 17. Linking Angles
  • 18. An Angle in the Bend
  • 19. Morphing a rectangle

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Properties of Chords and Angles

Properties of Chords and Angles
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