# Catriona Aggâ€™s Geometry Puzzles

1. three squares ii May 2, 2021

2. two overlapping triangles ii Apr 11, 2021

3. two regular hexagons ii Apr 10, 2021

4. isosceles and equilateral triangles Apr 10, 2021

5. two concentric circles Apr 10, 2021

6. four squares and a quarter circle Apr 9, 2021

7. hexagon and a square Apr 6, 2021

8. two quarter circles in a square ii Apr 5, 2021

9. four squares in a semi-circle Apr 4, 2021

10. triangle in two tilted squares Apr 3, 2021

11. quarter circle overlapping a circle Apr 2, 2021

12. five equilateral triangles Apr 1, 2021

13. four equilateral triangles inside a hexagon Mar 31, 2021

14. two quarter circles in a semi-circle ii Mar 30, 2021

15. three squares iii Mar 29, 2021

16. four squares vii Mar 28, 2021

17. seven quarter circles inside a semi-circle Mar 27, 2021

18. two hexagons and a triangle Mar 26, 2021

19. two squares inside a semi-circle Mar 23, 2021

20. five semi-circles Mar 22, 2021

21. four squares vi Mar 21, 2021

22. four parallel semi-circles Mar 20, 2021

23. three overlapping hexagons Mar 19, 2021

24. four squares v Mar 18, 2021

25. two squares on a hexagon Mar 17, 2021

26. semi-circles in a rectangle Mar 16, 2021

SemiCirclesinaRectangle_small.png

27. three triangles in a hexagon Mar 15, 2021

28. striped semi-circle Mar 14, 2021

29. two quarter circles and a semi-circle ii Mar 13, 2021

30. five quarter circles Mar 12, 2021

31. subdivided hexagon Mar 10, 2021

32. multiple semi-circles iii Mar 7, 2021

33. three overlapping semi-circles Mar 6, 2021

34. three quarter circles Mar 2, 2021

35. two squares on a diameter of a circle Mar 1, 2021

36. a hexagon and a nonagon Feb 28, 2021

37. four quarter circles in a circle Feb 27, 2021

38. three regular hexagons Feb 26, 2021

39. two squares overlapping a square ii Feb 23, 2021

40. three congruent triangles Feb 21, 2021

41. two triangles overlapping a quarter circle Feb 20, 2021

42. three congruent rectangles iii Feb 19, 2021

43. three congruent triangles in a semi-circle Feb 18, 2021

44. triangle over a circle Feb 17, 2021

45. multiple semi-circles iv Feb 16, 2021

46. four squares iv Feb 15, 2021

47. two squares overlapping a square Feb 14, 2021

48. zig-zag inside a square Feb 13, 2021

49. two semi-circles in a semi-circle Feb 11, 2021

50. six triangles in a hexagon Feb 9, 2021

51. two overlapping triangles Feb 7, 2021

52. four squares inside a rectangle Jan 31, 2021

53. two triangles in a circle and semi-circle Jan 30, 2021

54. triangle in a rectangle Jan 29, 2021

55. multiple semi-circles ii Jan 27, 2021

56. square overlapping a square and a rectangle Jan 24, 2021

57. chord splitting a square in half Jan 23, 2021

58. rectangle tilted over a square Jan 16, 2021

59. multiple angles Jan 10, 2021

60. four triangles in a square Dec 31, 2020

61. zig-zag inside a rectangle Dec 30, 2020

62. five squares across a square Dec 23, 2020

63. two squares and a semi-circle Dec 13, 2020

64. two circles in a square ii Oct 31, 2020

65. triangles formed from rectangles Oct 29, 2020

66. three triangles in a circle in a triangle Oct 24, 2020

67. two quarter circles in a semi-circle Aug 31, 2020

68. circle inside a triangle Aug 28, 2020

69. similar rectangles Aug 26, 2020

70. two semi-circles in a circle Aug 21, 2020

71. semi-circle and quarter circle in a square Aug 17, 2020

72. multiple semi-circles in a circle Aug 15, 2020

73. four squares iii Aug 14, 2020

74. triangle over two rectangles Aug 7, 2020

75. subdivided decagon Jul 30, 2020

76. two congruent rectangles and a semi-circle Jul 29, 2020

77. a rectangle in a square Jul 26, 2020

78. two half-squares and a circle Jul 25, 2020

79. three congruent rectangles ii Jul 23, 2020

80. semi-circle in a square in a quarter circle Jul 19, 2020

81. two triangles and three concentric semi-circles Jul 18, 2020

82. five congruent rectangles Jul 15, 2020

83. five rectangles tiling a square Jul 11, 2020

84. rectangle overlapping a circle Jul 5, 2020

85. swirling semi-circles Jun 14, 2020

86. hexagon in a quarter circle May 31, 2020

87. six semi-circles inside a hexagon May 30, 2020

88. four quarter circles May 29, 2020

89. two overlapping triangles and a circle May 28, 2020

90. two squares diagonally inside a rectangle May 26, 2020

91. two circles and two semi-circles May 25, 2020

92. two tilted squares May 23, 2020

93. a circle and two semi-circles in two hexagons May 14, 2020

94. four squares overlapping a rectangle May 9, 2020

95. two semi-circles and a triangle May 8, 2020

96. a square and a hexagon May 5, 2020

97. five circles in a square May 2, 2020

98. four squares ii Apr 28, 2020

99. four squares Apr 26, 2020

100. two circles inside an equilateral triangle Apr 25, 2020

101. three congruent rectangles Apr 24, 2020

102. four congruent squares inside a larger square Apr 23, 2020

103. two semi-circles and an equilateral triangle Apr 22, 2020

104. two quarter circles and a semi-circle Apr 21, 2020

105. three stacked squares Apr 19, 2020

106. two circles in a square Apr 18, 2020

107. three overlapping rectangles ii Apr 17, 2020

108. semi-circle splitting a triangle Apr 16, 2020

109. two semi-circles diagonally across a square Apr 15, 2020

110. two neighbouring rectangles Apr 13, 2020

111. two overlapping semi-circles Apr 12, 2020

112. nested semi-circles Apr 11, 2020

113. two circles in a triangle Apr 10, 2020

114. tangential hexagon and circle Apr 9, 2020

115. three overlapping rectangles Apr 8, 2020

116. three circles forming a triangle Apr 7, 2020

117. four squares in a circle Apr 6, 2020

118. three equal area rectangles Apr 5, 2020

119. six equal area rectangles Apr 4, 2020

120. angle formed by three squares Apr 2, 2020

121. quadrilateral splitting a semi-circle Apr 1, 2020

122. two regular hexagons Mar 28, 2020

123. three squares in a circle Mar 21, 2020

124. two squares and an equilateral triangle Mar 14, 2020

125. quarter circles in a rectangle in a circle Mar 7, 2020

126. nested isosceles triangles Mar 5, 2020

127. five circles in a rectangle in a semi-circle Feb 29, 2020

128. two semi-circles inside a rectangle Feb 23, 2020

129. two squares inside an equilateral triangle Feb 22, 2020

130. tilted rectangle in a square Feb 20, 2020

131. circle in a quarter circle Feb 18, 2020

132. three semi-circles Feb 16, 2020

133. a square and a rectangle overlapping Feb 14, 2020

134. three circles in a hexagon in a circle Feb 10, 2020

135. three circles Feb 8, 2020

136. three squares in a triangle Feb 4, 2020

137. four squares Feb 1, 2020

138. arcs in a semi-circle Jan 30, 2020

139. three isoscelese triangles inside a triangle Jan 23, 2020

140. three stacked squares and a fourth square Jan 12, 2020

141. parallelogram area Jan 7, 2020

142. three squares Jan 4, 2020

143. parallelogram in a rectangle Jan 1, 2020

144. three circles in a rectangle Dec 31, 2019

145. two semi-circles inside a semi-circle Dec 29, 2019

146. two squares Dec 28, 2019

147. pentagram in a circle Dec 24, 2019

148. rectangle quartered by semi-circles Dec 23, 2019

149. chord dividing a triangle into two Dec 22, 2019

150. two pentagons Dec 20, 2019

151. two circles in a rectangle Dec 17, 2019

152. angle formed by three rectangles Dec 14, 2019

153. two rectangles in a square Dec 12, 2019

154. five semi-circles around a rectangle Dec 11, 2019

155. three equal angles in a rectangle Dec 7, 2019

156. a square, a circle, and a rectangle Dec 4, 2019

157. three right-angled triangles Nov 30, 2019

158. two rectangles overlapping a square Nov 24, 2019

159. areas in a crossed trapezium Nov 20, 2019

160. seven hexagons Nov 18, 2019

161. a pattern of squares Nov 17, 2019

162. three hexagons and a rectangle Nov 15, 2019

163. six circles inside a circle inside a square Nov 9, 2019

164. stacked squares inside two squares Nov 7, 2019

165. three squares inside a triangle Oct 30, 2019

166. three congruent triangles Oct 29, 2019

167. two semi-circles inside a semi-circle ii Oct 27, 2019

168. multiple semi-circles Oct 25, 2019

169. two congruent rectangles in a square Oct 24, 2019

170. three circles in a rectangle ii Oct 19, 2019

171. overlapping triangles in a circle Oct 13, 2019

172. diagonal in a square Oct 11, 2019

173. seven circles Oct 5, 2019

174. angles in two hexagons Sep 28, 2019

175. three overlapping squares Sep 19, 2019

176. four squares and a semi-circle Sep 7, 2019

177. two overlapping hexagons and a rectangle Sep 2, 2019

178. two rectangles of equal area Aug 31, 2019

179. three squares overlapping a semi-circle Aug 29, 2019

180. two hexagons and a square Aug 28, 2019

181. four hexagons Aug 26, 2019

182. two squares in a semi-circle Aug 24, 2019

183. three squares in a semi-circle Aug 23, 2019

184. three congruent squares overlapping a square Aug 22, 2019

185. three triangles in a square Aug 20, 2019

186. trisected hexagon Aug 19, 2019

187. two congruent quadrilaterals and a rectangle Aug 16, 2019

188. semi-circle in a square Aug 14, 2019

189. circle in pentagon in semi-circle Aug 11, 2019

190. rectangles in concentric rings Aug 9, 2019

191. three regular hexagons Aug 8, 2019

192. two rectangles and a semi-circle Aug 3, 2019

193. three circles in a semi-circle Aug 1, 2019

194. upside-down semi-circles in a semi-circle Jul 30, 2019

195. stacked triangles Jul 29, 2019

196. triangles in a dodecagon Jul 27, 2019

197. angle formed by two squares ii Jul 26, 2019

198. three parallel semi-circles Jul 24, 2019

199. semi-circle in a right-angled triangle Jul 23, 2019

200. three congruent squares in a rectangle Jul 22, 2019

201. three hexagons in a trapezium Jul 20, 2019

202. stack of congruent rectangles Jun 28, 2019

203. angles in a circle Jun 27, 2019

204. striped dodecagon Jun 24, 2019

205. two squares overlapping a third square Jun 15, 2019

206. three squares and a semi-circle Jun 7, 2019

207. three congruent rectangles ii Jun 4, 2019

208. rectangle, circle, and triangle Jun 1, 2019

209. two regular hexagons May 30, 2019

210. angle in a circle and semi-circle May 28, 2019

211. circle and two squares May 26, 2019

212. divided hexagon May 25, 2019

213. two overlapping squares May 20, 2019

214. two squares in a triangle May 19, 2019

215. a semi-circle and quarter circle in a square May 17, 2019

216. overlapping triangle and hexagon May 14, 2019

217. overlapping triangle and rectangle May 10, 2019

218. divided hexagon ii May 8, 2019

219. semi-circle between two quarter circles May 6, 2019

220. two squares and two equilateral triangles ii May 5, 2019

221. angles in two circles May 3, 2019

222. square with midpoints May 1, 2019

223. angle formed by two squares Apr 28, 2019

224. two circles inside two polygons inside a circle Apr 26, 2019

225. quartered hexagon Apr 24, 2019

226. two semi-circles in a square Apr 22, 2019

227. three semi-circles around a triangle Apr 20, 2019

228. two overlapping squares ii Apr 18, 2019

229. two rectangles with diagonals Apr 17, 2019

230. two semi-circles and a rectangle Apr 16, 2019

231. semi-circle on a hexagon Apr 14, 2019

232. divided square Apr 12, 2019

233. three adjacent triangles Apr 10, 2019

234. triangle and circle inside square Apr 7, 2019

235. two squares on a triangle Apr 4, 2019

236. square, rectangle, and two semi-circles Apr 3, 2019

237. three triangles and a rectangle inside a circle Mar 30, 2019

238. triangle inside a square Mar 26, 2019

239. triangle inside circle and triangle Mar 20, 2019

240. circle in triangle in square Mar 17, 2019

241. quarter circles in a square in a circle Mar 16, 2019

242. triangle overlapping a hexagon Mar 13, 2019

243. two circles in a triangle Mar 10, 2019

244. inverse star in a rectangle Mar 7, 2019

245. three overlapping circles Mar 3, 2019

246. three tilted rectangles Mar 1, 2019

247. overlapping hexagons Feb 26, 2019

248. square overlapping a quarter circle Feb 24, 2019

249. two hexagons in a rectangle Feb 23, 2019

250. semi-circle in a circle Feb 22, 2019

251. two triangles overlapping a rectangle Feb 21, 2019

252. square on an octagon Feb 19, 2019

253. circle and semi-circle in triangle Feb 18, 2019

254. overlapping triangles Feb 16, 2019

255. tilted rectangles Feb 13, 2019

256. triangle in semi-circle with square Feb 11, 2019

257. circles in overlapping triangles Feb 7, 2019

258. tilted triangles Feb 2, 2019

259. two quarter circles in a square Jan 28, 2019

260. two squares and a rectangle in an octagon Jan 26, 2019

261. square overlapping a circle Jan 25, 2019

262. six semi-circles in a circle Jan 21, 2019

263. rectangle on a hexagon Jan 19, 2019

264. two squares on a circle Jan 16, 2019

265. pentagon with two semi-circles Jan 14, 2019

266. striped hexagon Jan 13, 2019

267. circle in a hexagon in a semi-circle Jan 11, 2019

268. overlapping rectangle and semi-circle Jan 5, 2019

269. two rectangles in a semi-circle Dec 31, 2018

270. divided hexagon iii Dec 30, 2018

271. circles around a triangle Dec 16, 2018

272. rectangles stacked in a semi-circle Dec 12, 2018

273. two circles, two squares Dec 11, 2018

274. subdivided square Dec 5, 2018

275. chords dividing a triangle into five Dec 3, 2018

276. three rectangles as a triangle Dec 1, 2018

277. partitioned square Nov 28, 2018

278. two squares overlapping a semi-circle Nov 26, 2018

279. five triangles in a rectangle Nov 25, 2018

280. nested circles and a triangle Nov 24, 2018

281. square in a triangle in a square Nov 23, 2018

282. quarter circles in a rectangle Nov 22, 2018

283. semi-circles in a quarter circle Nov 21, 2018

284. three squares on a line Nov 19, 2018

285. nested circles and polygons Nov 18, 2018

286. semi-circle and tangents in a square Nov 17, 2018

287. three regular hexagons ii Nov 14, 2018

288. triangles in a semi-circle Nov 13, 2018

289. equilateral triangles in a square Nov 12, 2018

290. three aligned triangles Nov 11, 2018

291. crossed hexagon Nov 10, 2018

292. square in a semi-circle in a square Nov 8, 2018

293. two equilateral triangles in a semi-circle Nov 7, 2018

294. three squares in a circle Nov 5, 2018

295. arcs inside a triangle Nov 2, 2018

296. quadrilateral from two squares in a square Oct 30, 2018

297. triangle centres and square corners Oct 29, 2018

298. hexagon and concentric circles Oct 28, 2018

299. chord and annulus Oct 27, 2018

300. dissected hexagon Oct 26, 2018

301. circles in rhombii sequal Oct 26, 2018

302. circles in triangle and rhombus Oct 25, 2018

303. circles resting on triangles Oct 24, 2018

304. arbelos Oct 23, 2018

305. four circles in a triangle in a circle Oct 22, 2018

306. triangles with a parallelogram Oct 21, 2018

307. three squares in a square Oct 18, 2018

308. two circles in an equilateral triangle Oct 17, 2018

309. semi-circles in a square Oct 15, 2018

310. five rectangles in a square Oct 14, 2018

311. five overlapping circles Oct 11, 2018

312. four regular polygons Oct 8, 2018

313. four squares around a quadrilateral Oct 7, 2018

314. two perpendicular equilateral triangles Oct 6, 2018

315. nested circles and polygons ii Oct 5, 2018

316. spiralling semi-circles Oct 3, 2018

317. five decreasing squares Oct 1, 2018

318. triangle and semi-circle in a circle Sep 29, 2018

319. subdivided parallelogram Sep 27, 2018

320. triangle in four rectangles Sep 26, 2018

321. circle in a trapezium Sep 24, 2018

322. subdivided triangle Sep 19, 2018

323. two circles inside a square Sep 17, 2018

324. concentric semi-circles Sep 16, 2018

325. shaded spikes in a hexagon Sep 14, 2018

326. squares in an octagon Sep 11, 2018

327. four squares in a big square Sep 9, 2018

328. four stacked squares in a circle in a square Sep 8, 2018

329. stacked boxes in circles in squares Sep 8, 2018

330. overlapping square and circle Sep 6, 2018

331. arcs in a circle Sep 1, 2018

332. six squares in a hexagon Aug 31, 2018

333. four equilateral triangles round a square Aug 30, 2018

334. two overlapping squares iii Aug 28, 2018

335. two isosceles triangles Aug 28, 2018

336. four isosceles triangles in a circle Aug 26, 2018

337. hexagon in a star in a hexagon Aug 24, 2018

338. stacked hexagons Aug 23, 2018

339. a square, triangle, and circle in a square Aug 22, 2018

340. region of an octagon Aug 21, 2018

341. semi-circle in a square Aug 20, 2018

342. polygons with equal perimeter Aug 19, 2018

343. stacked shapes Aug 19, 2018

344. four squares overlapping a circle Aug 17, 2018

345. triangle in circle in triangle in semi-circle Aug 15, 2018

346. bell-ringing braids Aug 14, 2018

347. four equilateral triangles Aug 13, 2018

348. two squares and two equilateral triangles Aug 13, 2018

TwoSquaresandTwoEquilateralTriangles_small.png

349. squares meeting in a circle Aug 12, 2018

350. zig-zag triangles Aug 12, 2018

351. four aligned squares Aug 10, 2018

352. lengths in a crossed trapezium Aug 9, 2018

353. three aligned squares Aug 9, 2018

354. overlapping squares Aug 8, 2018

355. toppled square Aug 7, 2018

356. two rectangles overlapping a circle Aug 2, 2018

357. subdivided circles May 21, 2018