K-8 Geometry

John Golden


  • 1. Classifying Quadrilaterals
  • 2. Triangle Types
  • 3. Square Not Square
  • 4. Random Triangle
  • 5. Flip Flop
  • 6. Triangle with Squares
  • 7. Triangles
  • 8. Triangle Truths
  • 9. Classifying Quadrilaterals
  • 10. Clown!
  • 11. Pythagorean Tiling
  • 12. Transformations - Multi-Step
  • 13. Two Reflections
  • 14. The Parallelogram Factory
  • 15. Isosceles triangle factory
  • 16. Triangle By Sides
  • 17. Pythagorean by Refection
  • 18. Pythagorean Data
  • 19. Elements, Book I, Proposition 47
  • 20. pythagorean theorem (proof)
  • 21. Pythagorean Rearrangement
  • 22. Quadrilateral by Diagonal
  • 23. Diagonal Lengths
  • 24. Isosceles Triangles - Examples and Non-Examples
  • 25. DaVinci's Pythagorean Theorem
  • 26. mosaic puzzle
  • 27. Triangle Dilations
  • 28. Tiles
  • 29. Kaercher-Rubik's Flexagon Template
  • 30. max bill Pythagorean Squares
  • 31. Reflect on geometric areas
  • 32. Quarter the Cross: 4 Dot Challenge
  • 33. Area of a Triangle (V3)
  • 34. Pyramids in Prism
  • 35. Three Pyramids to Form a Cube

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Classifying Quadrilaterals

Classify quadrilaterals A to T by coloouring. (Click a quadrilateral at the right, then click those quadrilaterals A to T in the same class.)[br]Drag and rotate (the red point) the ruler to measure lengths and right angles.
– Anthony OR 柯志明

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