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A user with 190 edits. Account created on 5 February 2009.

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22:4922:49, 13 July 2025 diff hist +148 m Sylvester's triangle problem →External links: ... Added a link to an interactive, dynamic geometry sketch current

07:0307:03, 4 July 2025 diff hist +1 m Thomsen's theorem Correction of 'diagonal' to 'diagonals' current

19:5219:52, 28 June 2025 diff hist −272 m Thomsen's theorem No edit summary
19:5019:50, 28 June 2025 diff hist 0 m Thomsen's theorem No edit summary
19:4819:48, 28 June 2025 diff hist +341 m Thomsen's theorem →External links
19:4519:45, 28 June 2025 diff hist −19 m Thomsen's theorem →References: Added a reference in relation to a further generalization of Thomsen's Theorem
19:4019:40, 28 June 2025 diff hist +107 m Thomsen's theorem Added a sentence about a further generalization of this theorem.
19:3619:36, 28 June 2025 diff hist +343 m Thomsen's theorem →References: Added a reference in relation to a further generalization of Thomsen's Theorem
19:3119:31, 28 June 2025 diff hist +42 m Kite (geometry) →References: ... Changed the De Villiers reference to Some Adventures in Euclidean Geometry as that is now free to download. current

19:5019:50, 10 May 2025 diff hist 0 m Japanese theorem for cyclic quadrilaterals →External links current
19:4919:49, 10 May 2025 diff hist +140 m Japanese theorem for cyclic quadrilaterals →External links: ... Added an external link to a dynamic page illustrating the result and which contains links to some other proofs.

06:0506:05, 22 October 2024 diff hist −3 m Bretschneider's formula →Formulation
06:0406:04, 22 October 2024 diff hist +95 m Bretschneider's formula →Formulation: ... added "as long as directed angles are used"
06:0206:02, 22 October 2024 diff hist −16 Bretschneider's formula →Formulation
06:0106:01, 22 October 2024 diff hist +49 m Bretschneider's formula →Formulation

19:2519:25, 21 October 2024 diff hist +260 m Bretschneider's formula →External links: ... Added external link to a dynamic geometry sketch.
19:2019:20, 21 October 2024 diff hist +66 m Bretschneider's formula Have added this: The formula also works on crossed quadrilaterals provided that directed angles are used.
19:1619:16, 21 October 2024 diff hist +7 m Brahmagupta's formula →Trigonometric proof: ... Added convex as the proof only works for convex cyclic quadrilaterals.
19:1419:14, 21 October 2024 diff hist +14 m Brahmagupta's formula Have added that the cyclic quadrilateral has to be convex as Brahmagupta's formula does not apply to crossed cyclic quadrilaterals.

18:5918:59, 9 October 2024 diff hist +324 m Orthodiagonal quadrilateral Added external link to an interesting property of an orthodiagonal quadrilateral

10:2210:22, 8 October 2024 diff hist +321 m Equidiagonal quadrilateral Added external link to an interesting property of an equidiagonal quadrilateral

13:2913:29, 16 December 2023 diff hist +720 User talk:Geometryfan →golden parallelogram: Reply Tag: Reply
04:4004:40, 16 December 2023 diff hist +1,762 User talk:Geometryfan →golden parallelogram: Reply Tag: Reply

19:4319:43, 15 December 2023 diff hist +764 User talk:Geometryfan →golden parallelogram: Reply Tag: Reply
07:0507:05, 15 December 2023 diff hist +445 User talk:Geometryfan →golden parallelogram: Reply Tag: Reply

13:5413:54, 6 December 2023 diff hist +315 Napoleon's theorem →Generalisations: Added hexagon generalization by Dao Than Oai
13:4813:48, 6 December 2023 diff hist +122 m Napoleon's theorem →Dao Than Oai’s generalization
13:4413:44, 6 December 2023 diff hist +543 Napoleon's theorem →Generalisations

20:2820:28, 30 November 2023 diff hist +7 m Golden ratio →Geometry
20:2620:26, 30 November 2023 diff hist +1 m Golden ratio →Golden parallelogram
20:2520:25, 30 November 2023 diff hist +1 m Golden ratio →Golden parallelogram
20:2420:24, 30 November 2023 diff hist +835 Golden ratio →Geometry: ... Added an entry for a golden parallelogram

05:5805:58, 29 November 2023 diff hist −27 m Golden ratio →External links Tag: Reverted
05:5605:56, 29 November 2023 diff hist +253 m Golden ratio →External links: ... Added an external link to Golden Quadrilaterals Tag: Reverted

20:5620:56, 14 November 2023 diff hist −1 m Cyclic quadrilateral →Supplementary angles
20:5520:55, 14 November 2023 diff hist +30 m Cyclic quadrilateral →Supplementary angles
20:5020:50, 14 November 2023 diff hist 0 m Cyclic quadrilateral →Supplementary angles
20:4820:48, 14 November 2023 diff hist −49 m Cyclic quadrilateral →Supplementary angles: Removed DOI from reference
20:4520:45, 14 November 2023 diff hist +608 m Cyclic quadrilateral →Supplementary angles: ... Added further generalization
18:4418:44, 14 November 2023 diff hist +1 m Jacobi's theorem (geometry) No edit summary
18:3218:32, 14 November 2023 diff hist +755 m Jacobi's theorem (geometry) Added a further generalization of the Jacobi point
18:2018:20, 14 November 2023 diff hist +355 m Jacobi's theorem (geometry) No edit summary
18:1918:19, 14 November 2023 diff hist +92 m Fermat point →External links Tag: Reverted

19:1419:14, 13 November 2023 diff hist +14 m Similarity (geometry) →External links
19:1419:14, 13 November 2023 diff hist +28 m Similarity (geometry) →External links
19:1219:12, 13 November 2023 diff hist +113 m Similarity (geometry) →External links

05:3705:37, 10 October 2023 diff hist −19 m Perpendicular bisector construction of a quadrilateral →External links
05:3605:36, 10 October 2023 diff hist +320 m Perpendicular bisector construction of a quadrilateral →References: Relevant external link added
05:3205:32, 10 October 2023 diff hist +11 m Perpendicular bisector construction of a quadrilateral →Properties
05:3105:31, 10 October 2023 diff hist +368 m Perpendicular bisector construction of a quadrilateral →Properties: Additional property & refence

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