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McCay Circle

If the Vertex $A_1$ of a Triangle describes the Neuberg Circle $n_1$, its Median Point describes a circle whose radius is 1/3 that of the Neuberg Circle. Such a Circle is known as a McKay circle, and the three McCay circles are Concurrent at the Median Point $M$. Three homologous collinear points lie on the McCay circles.

See also Circle, Concurrent, Median Point, Neuberg Circles


Johnson, R. A. Modern Geometry: An Elementary Treatise on the Geometry of the Triangle and the Circle. Boston, MA: Houghton Mifflin, pp. 290 and 306, 1929.

© 1996-9 Eric W. Weisstein