Euler Line
The line segment that passes
through a triangle’s orthocenter, centroid, and circumcenter.
These three points are
collinear for any triangle. In addition, the distance from the
orthocenter to the centroid is twice the distance from the circumcenter
to the centroid.
Note: Euler is pronounced "Oiler".
See also
Euler's formula, Euler's formula for polyhedra
