| Term | Definition |
| Angle Bisector | Ray that divides an angle into 2=angles |
| Incenter | Is equidistant to the sides of triangle |
| Altitudes | Segment from a vertex to opposite side and it's perpendicular to opposite side |
| Orthocenter | Has no special features of point of concurrency |
| Medians | Segment whose endpoints are vertex and midpoint of opposite side |
| Centroid | Is 2/3 the distance from a vertex |
| Perpendicular Bisectors | A line segment or ray that passes thru the midpoint and is perpendicular to the side |
| Circumcenter | Is equidistant from vertices |