# Topics List

### Orthologic triangles - Locus

(14)

Orthologic centers and homography Angel Montesdeoca, Centros ortológicos y homografía ...
Antreas Hatzipolakis

Apr 15

### Cyclologic triangles (Re: Orthologic triangles - Locus)

(5)

[A variation of a configuration by APH] Let ABC be a triangle, A'B'C' a variable triangle w/r to ABC and A1B1C1, A2B2C2 the medial triangles of ABC, A'B'C',
Antreas Hatzipolakis

Apr 13

### Orthologic triangles -- Locus

(5)

[APH]: Let ABC be a triangle and P a point. Denote: Pa = (Reflection of BC in PB) /\ (Reflection of BC in PC) Pb = (Reflection of CA in PC) /\ (Reflection of
Antreas Hatzipolakis

Mar 7

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### I - Concurrent NPCs

(6)

On Wed, Mar 4, 2015 at 7:11 PM, Antreas Hatzipolakis wrote: Let ABC be a triangle. ... ************************ On Wed, Mar 4, 2015 at 8:51 PM, Moses, Peter J.
Antreas Hatzipolakis

Mar 6

### Reflections - Loci

(3)

1. La, Lb, Lc are concurrent? (the entire plane, with point of concurrence the isogonal conjugate of P) Confirmed 2. ABC, A'B'C' are perspective? (the entire
Antreas Hatzipolakis

Feb 26

### Re: Point on the IH line

(4)

[APH]: The perpendiculars to HIa, HIb, HIc from A,B,C, resp. bound triangle A"B"C". Which point is the circumenter of A"B"C" ? Is it lying on the IH line? ...
Antreas Hatzipolakis

Feb 24

### Collinear Points

(10)

... *********************************************** [César Lozada] It is X(1141). [Peter Moses] Hi Antreas, X(1141). Best regards Peter. [APH]: [APH]: Let ABC
Antreas Hatzipolakis

Feb 19

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