INSTITUTO DE MATEMÁTICA
HJB --- GMA --- UFF

X(35)
({X(1),X(3)}-HARMONIC CONJUGATE OF X(36))


Click here to access the list of all triangle centers.

Interactive Applet

You can move the points A, B and C (click on the point and drag it).
Press the keys “+” and “−” to zoom in or zoom out the visualization window and use the arrow keys to translate it.

You can also construct all centers related with this one (as described in ETC) using the “Run Macro Tool”. To do this, click on the icon Run Macro Tool, select the center name from the list and, then, click on the vertices A, B and C successively.

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Download all construction files and macros: tc.zip (10.1 Mb).
This applet was built with the free and multiplatform dynamic geometry software C.a.R..


Information from Kimberling's Encyclopedia of Triangle Centers

Trilinears           1 + 2 cos A : 1 + 2 cos B : 1 + 2 cos C
                                    = f(a,b,c) : f(b,c,a) : f(c,a,b), where f(a,b,c) = a(b2 + c2 - a2 + bc)

Barycentrics    sin A + sin 2A : sin B + sin 2B : sin C + sin 2C
                                    = g(a,b,c) : g(b,c,a) : g(c,a,b), where g(a,b,c) = a2(b2 + c2 - a2 + bc)

Let A' be the inverse-in-circumcircle of the A-excenter, and define B' and C' cyclically. Then the lines AA', BB', CC' concur in X(35).

X(35) lies on these lines:
1,3    4,498    8,993    9,90    10,21    11,140    12,30    22,612    24,33    31,386    34,378    37,267    42,58    43,1011    47,212    71,284    72,191    73,74    79,226    172,187    228,846    255,991    376,388    404,1125    411,516    474,1001    495,550    496,549    497,499    500,1154    595,902    950,1006    968,975    1124,1152

X(35) is the {X(1),X(3)}-harmonic conjugate of X(36).

X(35) = isogonal conjugate of X(79)
X(35) = inverse-in-circumcircle of X(484)
X(35) = X(500)-cross conjugate of X(1)
X(35) = crosssum of X(481) and X(482)
X(35) = X(943)-aleph conjugate of X(35)
X(35) = X(I)-beth conjugate of X(J) for these (I,J): (100,35), (643,10)


This is a joint work of
Humberto José Bortolossi, Lis Ingrid Roque Lopes Custódio and Suely Machado Meireles Dias.

If you have questions or suggestions, please, contact us using the e-mail presented here.

Departamento de Matemática Aplicada -- Instituto de Matemática -- Universidade Federal Fluminense




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