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Triangle Centers

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centroid
the point of concurrency of the medians of a triangle
orthocenter
point of concurrency of the altitudes of a triangle
circumcenter
The point of concurrency of the perpendicular bisectors of a triangle
incenter
the point of concurrency of the angle bisectors of a triangle
midsegment
segment that connects the midpoints of two sides of a triangle
altitude
the perpendicular distance from the base of a geometric figure to opposite vertex (or side if parallel)
median
segment from a vertex to the midpoint of the opposite side