| r1620 |
altitude
feet, Euler line |
| r1648 |
cevian
circle, circumcenter, retrocenter,
symmedian
point |
| r1694 |
symmedian
point,
centroid,
isogonal
points |
| r1727 |
ninecircle,
pedal
circle, Euler line |
| r1939 |
orthocenter,
Euler
line,
circumcircle |
| r1940 |
orthocenter,
circumcircle |
