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perpendicular bisector
a segment of a triangle that includes one endpoint that is a vertex while the other endpoint lies upon a line containing the opposite side and it is also perpendicular to the line
altitude
a line of a triangle that perpendicularly bisects a side of the triangle
median
a segment of a triangle that includes one endpoint that is a vertex of that triangle while the other endpoint is a midpoint to the side opposite of that same vertex
angle bisector
a ray of a triangle that includes an endpoint that is a vertex of that triangle and it bisects that angle of the triangle
point of concurrency
a point that is the point of intersection of three or more lines, rays, or segments
centroid
a point of concurrency that is formed by the three medians of a triangle
orthocenter
a point of concurrency that is formed by the three altitudes of a triangle
circumcenter
a point of concurrency that is formed by the three perpendicular bisectors of a triangle
incenter
a point of concurrency that is formed by the three angle bisectors of a triangle
Note 
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