시계

sonom, Jung-Yong Jin, 22. jan. 2015


  • 1. a clock(2)
  • 2. measurements in a circle
  • 3. the triangle inequality
  • 4. the lunes of Alhazen
  • 5. the lune of Hippocrates
  • 6. tangent at a point
  • 7. tangent lines to a circle
  • 8. Thales' theorem
  • 9. tangent-chord angle
  • 10. square roots in a greek way...
  • 11. the golden ratio (and aphrodite's phi)
  • 12. geometric constructions - 2
  • 13. angles in a circle...
  • 14. archimedes' arbelos
  • 15. median to the hypotenuse
  • 16. inscribed quadrilaterals
  • 17. ptolemy's theorems
  • 18. power of a point
  • 19. the relative position of two circles
  • 20. central and inscribed angles
  • 21. a circle (equation)
  • 22. regular polygons
  • 23. simson line
  • 24. nine-point circle
  • 25. incircle and excircles of a triangle
  • 26. regular polygons-1
  • 27. an archimedes' formula
  • 28. area of a circle
  • 29. area of a circle-1
  • 30. radians
  • 31. equal chords
  • 32. an isosceles triangle...
  • 33. find the angles
  • 34. find the angle
  • 35. an equilateral triangle
  • 36. a Reuleaux triangle
  • 37. the witch of agnesi
  • 38. the cissoid of diocles
  • 39. deltoid
  • 40. astroid
  • 41. nephroid
  • 42. ranunculoid
  • 43. conchoid of nicomedes
  • 44. limacon of pascal
  • 45. cycloids
  • 46. conchoid of a circle
  • 47. piriform
  • 48. division of a segment
  • 49. an apollonian circle
  • 50. ellipse as a hypotrochoid
  • 51. ellipses and hyperbolas
  • 52. eight curve (construction)
  • 53. radical axis-1
  • 54. radical axis-2
  • 55. law of sines (proof)
  • 56. archimedes' twin circles
  • 57. roots of the quadratic equation
  • 58. archimedes' "salinon"
  • 59. the flower of life
  • 60. the seed of life
  • 61. yin-yang
  • 62. Johnson's theorem
  • 63. construction of a triangle (sss)
  • 64. miquel's triangle theorem
  • 65. proof of pythagorean-5
  • 66. hippias' quadratrix
  • 67. angle trisection
  • 68. first brocard point
  • 69. nagel point
  • 70. gergonne point
  • 71. rolling circle squares itself
  • 72. geometric-arithmetic mean inequality
  • 73. law of cosines (pww)
  • 74. chords and tangents
  • 75. regular star polygons
  • 76. squaring a rectangle
  • 77. pitot theorem
  • 78. angle between secants
  • 79. tangents to a circle
  • 80. a clock
  • 81. golden ratio-3
  • 82. equal chords-1
  • 83. the golden ratio and aphrodite's phi
  • 84. regular polygons
  • 85. angles in a circle...
  • 86. aristotle's wheel paradox
  • 87. parallel chords theorem
  • 88. secant-secant theorem
  • 89. tangent-secant theorem
  • 90. trigonometry_unit circle
  • 91. areas-3
  • 92. area of a triangle-2
  • 93. circle and ellipse
  • 94. Христос Bоскресе!
  • 95. circle-1
  • 96. f(x)=q+sqrt(r^2-(x-p)^2)
  • 97. basic trig numbers-2
  • 98. basic trig numbers-1
  • 99. rolling coin paradox
  • 100. feuerbach's point
  • 101. arc length (verification)
  • 102. tangent-chord angle-1
  • 103. tangent to a circle
  • 104. pentalpha
  • 105. properties of the altitudes
  • 106. common external tangents
  • 107. common internal tangents
  • 108. common external tangents-1
  • 109. common internal tangents-1
  • 110. approximating pi-1
  • 111. a clock-3
  • 112. proof of pythagorean-9
  • 113. circles of a regular n-gon
  • 114. Area of Circles (3)
  • 115. Rolling Coin 滾動的硬幣 (1)
  • 116. Seven Circles Theorem
  • 117. circumference of circles-1
  • 118. ferris wheel
  • 119. newton's disk
  • 120. a wheel of fortune-1
  • 121. conway circle
  • 122. regular polygons-3

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a clock(2)

a clock(2)
– sonom

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