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This file shows how to construct 4 triangle centers - orthocenter, circumcenter, centroid, and incenter. It includes some of the special relationships these centers have to the triangles and to each other. The first page is a summary with a mnemonic of the center and the construction to find the center. Each center has a printable page that can be used for notebooks or bulletin boards. The last page shows Euler's line for different triangles.