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 a(b + c)2 : b(c + a)2 : c(a + b)2
Barycentrics a2(b + c)2 : b2(c + a)2 : c2(a + b)2The circle having center X(39) and radius R tan ω sin 2ω, where R denotes the circumradius of triangle ABC, is here introduced as the Moses circle. It is tangent to the nine-point circle at X(115), and its internal and external centers of similitude with the incircle are X(1500) and X(1015), respectively. (Peter J. C. Moses, 5/29/03)
X(1500) lies on these lines:
1,39 6,595 10,37 11,1508 12,115 32,55 35,172 41,1017 42,213 56,574 76,192 216,1062 346,941 519,1107 612,1196 756,762 1124,1505 1335,1504X(1500) = isogonal conjugate of X(1509)
X(1500) = X(I)-Ceva conjugate of X(J) for these (I,J): (37,756), (42,872), (1018,512)
X(1500) = X(872)-cross conjugate of X(181)
X(1500) = crosspoint of X(37) and X(42)
X(1500) = crosssum of X(81) and X(86)