HJB --- GMA --- UFF


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: (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            f(a,b,c) : f(b,c,a) : f(c,a,b), where f(a,b,c) is as given just before X(2979), using U = X(98)
Barycentrics    af(a,b,c) : bf(b,c,a) : cf(c,a,b)

X(2987) lies on these lines:
25,110    37,1332    42,1331    69,2165    111,323    141,2963    193,317    251,1994    263,576    287,2395    511,1976    524,1989    526,895    651,1880    1400,1813

X(2987) = isogonal conjugate of X(230)
X(2987) = cevapoint of X(6) and X(511)
X(2987) = X(I)-cross conjugate of X(J) for these I,J: 6,2065    248,1297    1570,6    2422,805

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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