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) = (sin A)/(sin22A - sin 2B sin 2C)
Barycentrics (sin A)f(A,B,C) : (sin B)f(B,C,A) : (sin C)f(C,A,B)
X(1987) is discussed in Lemoine's paper cited at X(19). Contributed by Darij Grinberg.
X(1987) lies on these lines:
3,1625 54,112 69,1972 72,1956 237,248 290,297
X(1987) = isogonal conjugate of X(401)
X(1987) = cevapoint of X(217) and X(237)
X(1987) = X(232)-cross conjugate of X(6)