Encyclopedia of Triangle Centers

The Encyclopedia of Triangle Centers ( ETC) is an online list of more than 5400 ( February 2013 ) triangle points. It is maintained by Clark Kimberling, a professor of mathematics at the University of Evansville.

Each entry in the list is assigned a so-called Kimberling number in the form X (n). The information for each item include its trilinear and barycentric coordinates, and its position on straight lines connecting the other identified points. The ETC also offers a glossary of terms and definitions.

List of some triangle points with Kimberling number

Trilinear coordinates Inscribed circle Nine-point circle Nagel point Mittenpunkt Spieker circle Fermat point Isodynamic point Napoleon points De Longchamps point Schiffler point
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