| A | B |
|---|
| altitude | segment perpendicular from vertex to opposite side |
| orthocenter | intersection of altitudes |
| median | segment from vertex to midpoint of opposite side |
| equilibrium point | intersection of medians |
| angle bisector | segment that bisects a vertex angle of a triangle |
| incenter | intersection of angle bisectors |
| perpendicular bisector | segement perpendicular on midpoint of a side |
| circumcenter | intersection of perpendicualr bisectors |
