CONCURRENT LINES. Three or more lines that intersect at a common point. POINT OF CONCURRENCY. The point at which 3 or more lines intersect. Point of concurrency. CIRCUMCENTER. Point of concurrency for the perpendicular bisectors of a triangle. circumcenter. Circumscribed circle.
The circumcenter of a triangle is located equidistant from each vertex of the triangle.
incenter of the triangle is a point on the circle
AI = BI = CI
4 opposite side of a triangle
centroid opposite side of a triangle
orthocenter to the opposite side