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최재웅, May 13, 2017


  • 1. Cut-The-Knot Action !!!
  • 2. Congruent Corresponding Angles to Start? (Quick Investigation)
  • 3. Geometry Problem 479: Triangle, Cevians, Concurrency, Transversal, Proportion
  • 4. Discovering Pythagoras' Theorem by Area
  • 5. Go Geometry Problem 447
  • 6. Sections d'un parallélépipède rectangle
  • 7. Geometry - 4.7 AP1
  • 8. Proving Triangles Similar (3)
  • 9. Orthocenter
  • 10. Geometry - 8.7 AP2
  • 11. Pavés droits et volumes
  • 12. Geometry - 4.12 AP1
  • 13. SSS: Exercise 2
  • 14. Geometry - 8.4 AP1
  • 15. Geometry - 8.7 AP1
  • 16. Proportions in a Triangle 1
  • 17. Proportions in a Triangle 2
  • 18. Proportions in a Triangle 3
  • 19. Proportion in Parallel Lines
  • 20. SSS: Dynamically Illustrated
  • 21. Isosceles Trapezoid Midpoints
  • 22. Parallelogram Creation Exercise (III)
  • 23. Analogy between statics & geometry
  • 24. Midpoint & distance
  • 25. 3D Geometry Quickstart Info
  • 26. Parallel Consequence? (VB)
  • 27. Isosceles Triangle Medians
  • 28. Geometry - 4.1 AP1
  • 29. Spherical Geometry
  • 30. Item 5 - Temple Geometry
  • 31. right triangle paradox
  • 32. Fractions as parts of circles.
  • 33. Geometry - 6.10 AP1
  • 34. Corresponding angles at parallel lines
  • 35. 02.06 Module Two Activity Part 1 -
  • 36. Beräkna volym!
  • 37. difference of two squares
  • 38. SSA Theorem?
  • 39. Qarawiyyin Mosque
  • 40. Linear Transformations from Geometry
  • 41. Geometry Seasons Project
  • 42. Hyperbolic Geometry in the Poincaré Disk
  • 43. Transformations: Exercise 1
  • 44. Section d'un pavé droit
  • 45. Moss Egg by Robert Dixon
  • 46. AA Similarity Theorem
  • 47. Parallelogram Diagonals
  • 48. Isosceles Trapezoid Diagonals
  • 49. Rhombus Diagonals
  • 50. Transformations: Exercise 3

1.

Cut-The-Knot Action !!!

Creation of this applet was inspired by a [url=https://twitter.com/CutTheKnotMath/status/800924908616294400]tweet[/url] from [url=https://twitter.com/CutTheKnotMath]Alexander Bogomolny[/url] ([url=http://www.cut-the-knot.org/]Cut-The-Knot.org[/url]). [br][br][b]Feel free to move the BIG WHITE POINTS anywhere you'd like at any time! [/b][br][br]How can you formally prove what this applet informally illustrates?
Quick (Silent) Demo
– Tim Brzezinski

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