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.
|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) = bc[- 2a2cos A + b(a - b + c)cos B + c(a + b - c)cos C]
Barycentrics g(a,b,c) : g(b,c,a) : g(c,a,b), where g(a,b,c) = - 2a2cos A + b(a - b + c)cos B + c(a + b - c)cos C
Adrian Oldknow, "The Euler-Gergonne-Soddy Triangle of a Triangle," American Mathematical Monthly 103 (1996) 319-329. See page 328.
MathWorld, Evans Point
X(1375) lies on these lines: 2,3 241,514
X(1375) = complement of X(857)
X(1375) = crossdifference of any two points on line X(55)X(647)