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 bc(b2 - c2)2 : ca(c2 - a2)2 : ab(a2 - b2)2
= cos A - 2 cos(B - C) + cot ω sin A (Peter J. C. Moses, 9/12/03)Barycentrics (b2 - c2)2 : (c2 - a2)2 : (a2 - b2)2
X(115) lies on the nine-point circle
X(115) = X(99)-of-medial triangle
X(115) = X(101)-of-orthic triangleRoland H. Eddy and R. Fritsch, "The conics of Ludwig Kiepert: a comprehensive lesson in the geometry of the triangle," Mathematics Magazine 67 (1994) 188-205.
X(115) lies on these lines:
2,99 4,32 5,39 6,13 11,1015 30,187 50,231 53,133 76,626 116,1086 120,442 125,245 127,338 128,233 129,389 131,216 232,403 316,385 325,538 395,530 396,531 593,1029 804,1084X(115) = midpoint of X(I) and X(J) for these (I,J): (4,98), (13,14), (99,148), (316,385)
X(115) = reflection of X(I) in X(J) for these (I,J): (99,620), (114,5), (187,230), (325,625)
X(115) = isogonal conjugate of X(249)
X(115) = inverse-in-orthocentroidal-circle of X(6)
X(115) = complementary conjugate of X(512)
X(115) = X(I)-Ceva conjugate of X(J) for these (I,J): (2,523), (4,512), (338,125)
X(115) = crosspoint of X(I) and X(J) for these (I,J): (2,523), (68,525)
X(115) = crosssum of X(I) and X(J) for these (I,J): (6,110), (24,112), (163,849)
X(115) = crossdifference of any two points on line X(110)X(351)
X(115) = X(2)-Hirst inverse of X(148)