## X(616) (ANTICOMPLEMENT OF X(13))

 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 , select the center name from the list and, then, click on the vertices A, B and C successively.

 The JRE (Java Runtime Environment) is not enabled in your browser!

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) = [SBSC - 2SA(a2 + sqr(3) area)]/a

Trilinears            F(13)/a - 2 csc(A + π/3) : F(13)/b - 2 csc(B + π/3) : F(13)/c - 2 csc(C + π/3)

Barycentrics    g(a,b,c) : g(b,c,a) : g(c,a,b), where g(a,b,c) = af(a,b,c)

The midpoint of X(616) and X(617) is the Steiner point, X(99).

X(616) lies on these lines: 2,13    3,299    4,627    14,148    15,532    20,633    30,298    69,74    302,381    303,549    489,2043    490,2044

X(616) = reflection of X(I) in X(J) for these (I,J): (13,618), (148,14), (617,99), (621,298)
X(616) = anticomplement of X(13)
X(616) = anticomplementary conjugate of X(621)
X(616) = X(298)-Ceva conjugate of X(2)

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