| A | B |
|---|
| circumcenter | point where perpendicular bisectors intersect |
| incenter | center of inscribed circle |
| incenter | point where angle bisectors meet |
| circumscribed circle | circle around outside of triangle touching 3 vertices |
| circumcenter | center of circumscribed circle |
| inscribed circle | circle drawn inside a triangle touching 3 sides |
| transformation | movement of a figure |
| preimage | figure before transformation |
| image | figure after transformation |
| rigid transformations | do not change size or shape of figure |
| translation, rotation, reflection | 3 types of transformations studied |
| transformation known as a slide | translation |
| transformation known as a flip | reflection |
| points all move in straight line | translation |
| points move around given point | rotation |
| points flip across the mirror line | reflection |
| segment from triangle vertex perpendicular to opposite side | altitude |
| segment from triangle vertex to midpoint of opposite side | median |
| point where 3 altitudes intersect | orthocenter |
| point where 3 medians intersect | centroid |
| point equidistant from 3 vertices of triangle | circumcenter |
| point equidistant from 3 sides of triangle | incenter |
