| A | B |
|---|
| Perpendicular Bisector | segment perpendicular at the midpoint of a side of a triangle |
| Angle Bisector | segment from a vertex that divides the angle into two congruent angles |
| Median | segment from a vertex to the midpoint of the opposite side of a triangle |
| Altitude | segment from a vertex perpendicular to the opposite of a side of a triangle |
| Circumcenter | point of concurrency of the perpendicular bisectors |
| Incenter | point of concurrency of the angle bisectors |
| Orthocenter | point of concurrency of the altitudes |
| Centroid | point of concurrency of the medians |
