시계
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