7 terms

centroid

the point of concurrency of the medians 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

orthocenter

the point of concurrency of the altitudes of a triangle

point of concurrency

the point that all lines have in common, intersection

median of a triangle

a seg drawn from any vertex to the midpoint of the opposite side

altitude of a triangle

a seg drawn from any vertex perpendicular to the opposite side