Timeline for The centroid, the first and second Napoleon points and $X(930)$ lie on a circle
Current License: CC BY-SA 4.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 28, 2021 at 16:36 | vote | accept | Pedja | ||
| Jan 27, 2021 at 15:00 | answer | added | bathalf15320 | timeline score: 4 | |
| Jan 27, 2021 at 14:06 | comment | added | Max Alekseyev | To show that points are comcyclic using their coordinates, we don't need to compute center of the circle. The points $E,F,G,H$ are concyclic iff $$\det \begin{bmatrix} OE^2 & E_x & E_y & 1\\ OF^2 & F_x & F_y & 1\\ OG^2 & G_x & G_y & 1\\ OH^2 & H_x & H_y & 1 \end{bmatrix} = 0, $$ where $O=(0,0)$. | |
| Jan 27, 2021 at 9:41 | history | asked | Pedja | CC BY-SA 4.0 |