| A | B |
|---|
| midsegment | connects the midpoints of two sides of a triangle |
| hinge theorem | relates the sides of two different triangles |
| centroid | The medians of a triangle are concurrent at this point |
| triangle inequality | relates the three sides of one triangle |
| fractal | shape that looks the same at many levels |
| circumcenter | possibly outside the triangle |
| orthocenter | The altitudes of a triangle are concurrent at this point |
| perpendicular bisectors | concurrent at a point equidistant from the vertices of the triangle |
| incenter | equidistant from the sides of the triangle |
