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Perpendicular Bisector
Line, segment, or ray that passes through the midpoint of the side and is perpendicular to that side.

Concurrent Lines
When 3 or more lines intersect at a common point.

Point of Concurrency
The point of intersection of concurrent lines.

Circumcenter
The point of concurrency of the perpendicular bisectors of a triangle.

Median
A segment whose endpoints are a vertex of a triangle and the midpoint of the side opposite the vertex. Every triangle has 3.

Centroid
The point of concurrency for the medians of a triangle.

Altitude
Segment from a vertex to the line containing the opposite side & perpendicular to the line containing that side.

Orthocenter
The intersection points for the altitudes of a triangle.

