## X(649) (CROSSDIFFERENCE OF X(1) and X(2))

 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            a(b - c) : b(c - a) : c(a - b)

Barycentrics    a2(b - c) : b2(c - a) : c2(a - b)

X(649) lies on these lines:
31,884    42,788    44,513    57,1024    89,1022    100,660    101,901    109,919    187,237    190,889    239,514    693,812

X(649) = reflection of X(I) in X(J) for these (I,J): (661,650), (663,667)
X(649) = isogonal conjugate of X(190)
X(649) = isotomic conjugate of X(1978)
X(649) = X(I)-Ceva conjugate of X(J) for these (I,J): (57,244), (100,42), (101,6), (109,31), (190,1)
X(649) = X(512)-cross conjugate of X(513)
X(649) = crosspoint of X(I) and X(J) for these (I,J): (1,190), (6,101), (57,109), (81,100)

X(649) = crosssum of X(I) and X(J) for these (I,J): (1,649), (2,514), (9,522), (37,513), (100,644), (101,1331), (440,525), (523,1213)

X(649) = crossdifference of any two points on line X(1)X(2)

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