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.
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[a4 + 2a3(b + c) - 4a2bc - (b + c)(b - c)2(2a + b + c)]
= g(A,B,C) : g(B,C,A) : g(C,A,B), where g(A,B,C) = sin B sin C + cos B + cos C - cos A - 1
= h(A,B,C) : h(B,C,A) : h(C,A,B), where h(A,B,C) = cos B + cos C + cos B cos C - 1
= j(A,B,C) : j(B,C,A) : j(C,A,B), where j(A,B,C) = 1 - 2 cos2(B/2) cos2(C/2)Barycentrics af(a,b,c) : bf(b,c,a) : cf(c,a,b) = (sin A)g(A,B,C) : (sin B)g(B,C,A) : (sin C)g(C,A,B)
X(962) is shown in
Michael S. Longuet-Higgins, "On the principal centers of a triangle," Elemente der Mathematik 56 (2001) 122-129
to complete a simple pattern of collinearities.
X(962) lies on these lines:
1,7 2,40 4,8 30,944 55,411 65,497 145,515 149,151 165,1125 278,412 382,952 392,443 484,499 942,1058X(962) is the radical center of the circles centered at A, B, C, with respective
radii |CA| + |AB|, |AB| + |BC|, |BC| + |CA|. SeeFloor van Lamoen, Problem 10734, American Mathematical Monthly 107 (2000) 658-659;
X(962) = reflection of X(I) in X(J) for these (I,J): (8,4), (20,1), (40,946), (944,1482)
X(962) = isogonal conjugate of X(963)
X(962) = anticomplement of X(40)
X(962) = X(309)-Ceva conjugate of X(2)