geometry

sonom


  • 1. radical axis-1
  • 2. the golden ratio (and aphrodite's phi)
  • 3. rose curves
  • 4. angles between parallels...
  • 5. measuring angles...
  • 6. the lune of Hippocrates
  • 7. pythagorean theorem (a puzzle)
  • 8. the lunes of Alhazen
  • 9. triangle angle-sum theorem
  • 10. pythagorean spiral
  • 11. geometric constructions - 13
  • 12. power of a point
  • 13. Fibonacci spiral
  • 14. square vs rhombus
  • 15. geometric constructions - 12
  • 16. geometric constructions - 11
  • 17. geometric constructions - 2
  • 18. archimedes' arbelos
  • 19. a prism inside a prism...
  • 20. reflections...
  • 21. area of a trapezoid
  • 22. ptolemy's theorems
  • 23. pythagorean and galileo's law
  • 24. area of a triangle
  • 25. area of a parallelogram
  • 26. area of a rectangle
  • 27. approximating pi
  • 28. constructing a hyperbola...
  • 29. constructing an ellipse...
  • 30. constructing a parabola
  • 31. a pyramid inside a cube...
  • 32. a math trick-2
  • 33. angles in a circle...
  • 34. tux walks up and down...
  • 35. a triangle
  • 36. quadrilaterals
  • 37. square roots in a greek way...
  • 38. Thales' theorem
  • 39. regular octagon
  • 40. angle bisector
  • 41. inscribed quadrilaterals
  • 42. tangent at a point
  • 43. tangent lines to a circle
  • 44. double reflection
  • 45. triangles...
  • 46. a decagon
  • 47. the intersept (thales) theorem
  • 48. midpoint parallelogram
  • 49. classifying triangles...
  • 50. the reflective property of parabola
  • 51. the reflective property of ellipse
  • 52. the reflective property of hyperbola
  • 53. point symmetry
  • 54. the angle bisector theorems
  • 55. the triangle inequality
  • 56. triangle midpoint theorem
  • 57. reflections-2
  • 58. areas inside a parallelogram
  • 59. areas inside a trapezoid
  • 60. archimedes' spiral
  • 61. reflections-3
  • 62. involute of a circle
  • 63. cardioid
  • 64. reflections-4
  • 65. pythagorean theorem (proof)
  • 66. tangent-chord angle
  • 67. area of a kite
  • 68. median to the hypotenuse
  • 69. areas of similar triangles
  • 70. equilateral triangle (SAS)
  • 71. find the slope
  • 72. a proof of pythagorean theorem-4
  • 73. measurements in a circle
  • 74. the relative position of two circles
  • 75. a cube...
  • 76. regular tetrahedron
  • 77. hexagonal prism
  • 78. square pyramid
  • 79. the outer Napoleon triangle
  • 80. a pyramid inside a cube-1
  • 81. reflections of a triangle
  • 82. the golden ratio
  • 83. central and inscribed angles
  • 84. sierpinski triangles
  • 85. find the area
  • 86. regular polygons
  • 87. an identity...
  • 88. an identity-2
  • 89. triangle-1
  • 90. area of a rectangle-1
  • 91. simson line
  • 92. nine-point circle
  • 93. angle bisector as locus
  • 94. incircle and excircles of a triangle
  • 95. regular polygons-1
  • 96. an archimedes' formula
  • 97. area of a circle
  • 98. area of a circle-1
  • 99. radians
  • 100. properties of a rhombus
  • 101. properties of a rectangle
  • 102. properties of a trapezoid
  • 103. properties of a square
  • 104. axis of symmetry
  • 105. point of symmetry
  • 106. equal chords
  • 107. properties of an isosceles trapezoid
  • 108. an isosceles triangle...
  • 109. properties of a kite
  • 110. cuboid
  • 111. a tank with a tap
  • 112. find the angles
  • 113. find the angle
  • 114. an equilateral triangle
  • 115. sum of the interior angles of a n-gon
  • 116. a Reuleaux triangle
  • 117. congruent triangles
  • 118. area of an equilateral triangle
  • 119. the witch of agnesi
  • 120. the cissoid of diocles
  • 121. deltoid
  • 122. astroid
  • 123. nephroid
  • 124. ranunculoid
  • 125. conchoid of nicomedes
  • 126. limacon of pascal
  • 127. cycloids
  • 128. trammel of archimedes
  • 129. generalization (pappus) of pythagorean
  • 130. conchoid of a circle
  • 131. piriform
  • 132. ratio of areas-1
  • 133. ratio of areas-2
  • 134. division of a segment
  • 135. an apollonian circle
  • 136. parabolas
  • 137. ellipses
  • 138. hyperbolas
  • 139. a definition of conics (directrix)
  • 140. ellipse as a hypotrochoid
  • 141. ellipses and hyperbolas
  • 142. eight curve (construction)
  • 143. radical axis-2
  • 144. archimedes' twin circles
  • 145. archimedes' "salinon"
  • 146. the flower of life
  • 147. the seed of life
  • 148. yin-yang
  • 149. diagonals of n-gons
  • 150. Johnson's theorem
  • 151. Koch snowflake
  • 152. construction of a triangle (sss)
  • 153. miquel's triangle theorem
  • 154. proof of pythagorean-5
  • 155. Kaleidoscope
  • 156. the three squares problem
  • 157. hippias' quadratrix
  • 158. angle trisection
  • 159. first brocard point
  • 160. nagel point
  • 161. gergonne point
  • 162. collinear points-2
  • 163. morley's triangle
  • 164. rolling circle squares itself
  • 165. geometric-arithmetic mean inequality
  • 166. law of cosines (pww)
  • 167. vivianni's theorem
  • 168. x+1/x
  • 169. thm about right triangles
  • 170. chords and tangents
  • 171. regular star polygons
  • 172. squaring a rectangle
  • 173. pitot theorem
  • 174. angle between secants
  • 175. parallel tangents of an ellipse
  • 176. a property of the hyperbola
  • 177. tangents to a circle
  • 178. regular pentagon
  • 179. a clock
  • 180. a clock(2)
  • 181. five squares
  • 182. golden ratio-3
  • 183. golden triangle
  • 184. golden rectangle
  • 185. the famous "1/7" triangle
  • 186. the famous "1/5" square
  • 187. equal chords-1
  • 188. supplementary angles
  • 189. aristotle's wheel paradox
  • 190. parallel chords theorem
  • 191. from kite to rhombus and square
  • 192. chord theorem
  • 193. secant-secant theorem
  • 194. tangent-secant theorem
  • 195. fractions in a greek way...
  • 196. areas-3
  • 197. area of a triangle (sas)
  • 198. area of a quadrilateral
  • 199. area of a triangle-2
  • 200. Brahmagupta's formula
  • 201. a square in a square
  • 202. lemoine point
  • 203. exeter point
  • 204. pyth-proof
  • 205. pyth-proof7
  • 206. circle and ellipse
  • 207. bifolium
  • 208. kappacurve
  • 209. right strophoid
  • 210. parallel tangents of an ellipse-1
  • 211. folium
  • 212. torpedo curve
  • 213. constructing a trifolium
  • 214. trifolium-1
  • 215. bicorn
  • 216. trisectrix of maclaurin
  • 217. deltoid
  • 218. astroid
  • 219. versoria
  • 220. limacon of pascal-1
  • 221. cardioid-1
  • 222. cissoid of diokles
  • 223. lemniscate of bernoulli
  • 224. eightcurve
  • 225. conchoid of nicomedes-1
  • 226. ellipse-1
  • 227. circle-1
  • 228. hyperbola-1
  • 229. parabola-1
  • 230. quadrilaterals-2
  • 231. rolling coin paradox
  • 232. vecten points
  • 233. feuerbach's point
  • 234. arc length (verification)
  • 235. right triangle paradox
  • 236. square-rectangle paradox
  • 237. isosceles triangle paradox
  • 238. sphere in cylinder
  • 239. cone in cylinder
  • 240. tangent-chord angle-1
  • 241. inscribed angles-1
  • 242. tangent to a circle
  • 243. pentalpha
  • 244. star of david
  • 245. properties of the altitudes
  • 246. common external tangents
  • 247. common internal tangents
  • 248. common external tangents-1
  • 249. common internal tangents-1
  • 250. geometric mean theorem
  • 251. frustum of a right cone
  • 252. frustum of a regular pyramid
  • 253. cylinder in cone
  • 254. convex quadrilaterals
  • 255. approximating pi-1
  • 256. a clock-3
  • 257. find the area-1
  • 258. triangular numbers-1
  • 259. pythagorean triples-euclid
  • 260. pythagorean triples-plato
  • 261. pythagorean triples-proclus
  • 262. proof of pythagorean-9
  • 263. euclid's proof of pythagorean
  • 264. circles of a regular n-gon
  • 265. Area of Circles (3)
  • 266. Solving Similar Triangles (1)
  • 267. angles between parallels-1
  • 268. Water Triangle
  • 269. make an angle
  • 270. Seven Circles Theorem
  • 271. circumference of circles-1
  • 272. cube of a binomial
  • 273. cylinder in a cone
  • 274. ferris wheel
  • 275. the reuleaux triangle-1
  • 276. points and segments
  • 277. binomial formula
  • 278. difference of two squares
  • 279. conway circle
  • 280. parallels or not?
  • 281. lines through a point
  • 282. regular polygons-3
  • 283. string art
  • 284. the height of the pyramid

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radical axis-1

radical axis-1
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