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Triangle Centers

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Orthocenter -- intersection of ALTITUDES
Circumcenter -- intersection of PERPENDICULAR BISECTORS
Centroid -- intersection of MEDIANS
Incenter -- intersection of ANGLE BISECTORS
Excenter – intersection of three angle bisectors: the bisectors of two exterior angles and the bisector of the opposite interior angle. Depending on which angles you choose, you can find three different excenters for each triangle.
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