24 June 2025

• curprev 00:4400:44, 24 June 2025 Silverrush talk contribs m 9,741 bytes +50 →Solution 3 (Descartes' Theorem): added disclaimer
• curprev 00:3800:38, 24 June 2025 Silverrush talk contribs m 9,691 bytes −2 →Solution 3 (Descartes' Theorem): fixed a minor inaccuracy
• curprev 00:3700:37, 24 June 2025 Silverrush talk contribs 9,693 bytes +1,627 Added a solution.

18 October 2024

• curprev 12:5812:58, 18 October 2024 Yellowmoose1024 talk contribs m 8,066 bytes +12 →Solution 2 (Pythagorean Theorem)
• curprev 12:5712:57, 18 October 2024 Yellowmoose1024 talk contribs m 8,054 bytes +26 →Solution 2 (Pythagorean Theorem)

13 October 2024

• curprev 22:5122:51, 13 October 2024 Martin13579 talk contribs m 8,028 bytes −2 No edit summary

23 November 2023

• curprev 13:2413:24, 23 November 2023 Beishexi talk contribs m 8,030 bytes 0 →Problem

24 September 2021

• curprev 12:4712:47, 24 September 2021 Ssding talk contribs m 8,030 bytes −10 →See Also: Made the see also's after read "Last Problem" instead of "Last Problem this year"
• curprev 12:4512:45, 24 September 2021 Ssding talk contribs m 8,040 bytes +2 →Problem: Added a period and a space

15 June 2021

• curprev 15:2115:21, 15 June 2021 Ericpatrick2005 talk contribs 8,038 bytes +3,142 →Solution 1
• curprev 15:2115:21, 15 June 2021 Ericpatrick2005 talk contribs 4,896 bytes −3,142 →Solution 2 (Pythagorean Theorem)
• curprev 13:5213:52, 15 June 2021 Ericpatrick2005 talk contribs 8,038 bytes +10 →See Also
• curprev 13:5213:52, 15 June 2021 Ericpatrick2005 talk contribs 8,028 bytes +4 →Video Solution by Richard Rusczyk
• curprev 13:5213:52, 15 June 2021 Ericpatrick2005 talk contribs 8,024 bytes −4 →Video Solution by Richard Rusczyk
• curprev 13:5113:51, 15 June 2021 Ericpatrick2005 talk contribs m 8,028 bytes −1 →Solution 1
• curprev 13:5013:50, 15 June 2021 Ericpatrick2005 talk contribs 8,029 bytes 0 →Solution 1
• curprev 13:4313:43, 15 June 2021 Ericpatrick2005 talk contribs 8,029 bytes +123 →Problem
• curprev 13:4213:42, 15 June 2021 Ericpatrick2005 talk contribs 7,906 bytes −125 →Problem

15 May 2020

• curprev 13:0213:02, 15 May 2020 Dolphin7 talk contribs 8,031 bytes +114 No edit summary

25 January 2020

• curprev 19:5319:53, 25 January 2020 Rowechen talk contribs 7,917 bytes −511 Undo revision 115560 by Rowechen (talk) Tag: Undo
• curprev 19:5319:53, 25 January 2020 Rowechen talk contribs 8,428 bytes −1 Undo revision 115562 by Rowechen (talk) Tag: Undo
• curprev 19:5119:51, 25 January 2020 Rowechen talk contribs 8,429 bytes +1 →Solution 3
• curprev 19:5119:51, 25 January 2020 Rowechen talk contribs 8,428 bytes +511 No edit summary

23 November 2017

• curprev 22:4022:40, 23 November 2017 Agent43 talk contribs 7,917 bytes +73 Added the box at the bottom which was missing for some reason

9 August 2017

• curprev 20:5720:57, 9 August 2017 Ktong talk contribs 7,844 bytes +92 →Solution 2 (Pythagorean Theorem)
• curprev 20:5520:55, 9 August 2017 Ktong talk contribs 7,752 bytes 0 →Solution 2 (Proof of solution 1)
• curprev 20:1020:10, 9 August 2017 Ktong talk contribs 7,752 bytes +2,938 →Solution

1 February 2016

• curprev 13:1513:15, 1 February 2016 Puzzled417 talk contribs 4,814 bytes +67 →Solution

16 September 2015

• curprev 19:0019:00, 16 September 2015 Young2014 talk contribs 4,747 bytes −73 →See Also

28 March 2015

• curprev 09:4909:49, 28 March 2015 Acegikmoqsuwy2000 talk contribs m 4,820 bytes +3 Spelling

9 March 2015

• curprev 17:0917:09, 9 March 2015 Jhuang967 talk contribs 4,817 bytes −1 →Problem: fixed latex

5 February 2015

• curprev 02:5902:59, 5 February 2015 Hnkevin42 talk contribs 4,818 bytes +14 →Solution
• curprev 02:2402:24, 5 February 2015 Hnkevin42 talk contribs m 4,804 bytes +28 →Solution
• curprev 02:1302:13, 5 February 2015 Hnkevin42 talk contribs 4,776 bytes +2,529 →Solution
• curprev 01:0601:06, 5 February 2015 Hnkevin42 talk contribs 2,247 bytes +1,130 →Problem
• curprev 01:0001:00, 5 February 2015 Gina talk contribs 1,117 bytes +1,117 Created page with "==Problem== A collection of circles in the upper half-plane, all tangent to the <math>x</math>-axis, is constructed in layers as follows. Layer <math>L_0</math> consists of two ..."