triangle

sonom


  • 1. five squares
  • 2. triangle midpoint theorem
  • 3. the triangle inequality
  • 4. the lunes of Alhazen
  • 5. the lune of Hippocrates
  • 6. the angle bisector theorems
  • 7. classifying triangles...
  • 8. triangles...
  • 9. triangle angle-sum theorem
  • 10. square roots in a greek way...
  • 11. pythagorean theorem (a puzzle)
  • 12. area of a triangle
  • 13. a triangle
  • 14. archimedes' arbelos
  • 15. areas of similar triangles
  • 16. pythagorean theorem (proof)
  • 17. equilateral triangle (SAS)
  • 18. measuring van gogh's cypress
  • 19. the outer Napoleon triangle
  • 20. reflections of a triangle
  • 21. sierpinski triangles
  • 22. triangle-1
  • 23. right triangle trigonometry-1
  • 24. simson line
  • 25. nine-point circle
  • 26. angle bisector as locus
  • 27. incircle and excircles of a triangle
  • 28. an archimedes' formula
  • 29. axis of symmetry
  • 30. find the tan(φ)
  • 31. equal chords
  • 32. an isosceles triangle...
  • 33. cuboid
  • 34. an equilateral triangle
  • 35. sum of the interior angles of a n-gon
  • 36. a Reuleaux triangle
  • 37. congruent triangles
  • 38. minimum area (line)
  • 39. maximum area (angle)
  • 40. area of an equilateral triangle
  • 41. generalization (pappus) of pythagorean
  • 42. ratio of areas-1
  • 43. ratio of areas-2
  • 44. an apollonian circle
  • 45. law of sines (proof)
  • 46. law of cosines (proof)
  • 47. Johnson's theorem
  • 48. Koch snowflake
  • 49. construction of a triangle (sss)
  • 50. miquel's triangle theorem
  • 51. proof of pythagorean-5
  • 52. angle trisection
  • 53. first brocard point
  • 54. nagel point
  • 55. gergonne point
  • 56. morley's triangle
  • 57. distance between point-line
  • 58. vivianni's theorem
  • 59. chords and tangents
  • 60. the famous "1/7" triangle
  • 61. triangles...
  • 62. congruent triangles
  • 63. right triangle trigonometry
  • 64. right triangle trigonometry-2
  • 65. chord theorem
  • 66. area of a triangle (sas)
  • 67. area of a triangle-2
  • 68. a square in a square
  • 69. lemoine point
  • 70. exeter point
  • 71. vecten points
  • 72. feuerbach's point
  • 73. isosceles triangle paradox
  • 74. properties of the altitudes
  • 75. find the area-1
  • 76. triangular numbers
  • 77. Solving Similar Triangles (1)
  • 78. Water Triangle
  • 79. conway circle
  • 80. the height of the pyramid

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