| r1793 |
circumcevian
triangle, orthocenter,
ninecircle |
| r1798 |
orthocenter |
| r1820 |
altitudes,
parallelogic
triangles |
| r1822 |
circumcenter,
orthic
triangle, parallelogic triangles |
| r1828 |
altitude
feet, point X(110) |
| r1849 |
homothetic triangles |
| r1850 |
circumcevian
triangle,
perspective |
| r1875 |
ninecenter,
incenter,
concyclic
points |
| r1901 |
circumcenter,
radical
center |
| r1907 |
incenter,
ninecenter,
incentric
triangle,
pedal triangle,
isogonal
points |
| r1910 |
orthocenter,
ninecenter,
altitudes |
| r1913 |
orthocenter,
circumcenter,
ninecenter,
ninecircle |
| r1924 |
circumcenter,
ninecenter,
tangential
triangle,
homothetic triangles |
| r1927 |
incenter,
excenters |
| r1939 |
orthocenter,
circumcircle,
point
X(125) |
| r1945 |
incenter,
point
X(79) |
| r1946 |
incenter,
excenters,
Schiffler
point |
| r1947 |
incenter,
excenters,
point
X(80), point X(100) |
| r1954 |
ninecenter,
altitude
feet,
orthologic triangles,
orthocenter,
circumcenter,
centroid |
| r1957 |
ninecenter,
circumcenter |
| r1960 |
excenters,
ninecenter,
circumcenter |
| r1974 |
altitude
feet |
| r1983 |
circumcenter,
ninecenter,
altitude
feet,
point X(186) |
| r1985 |
ninecircle,
Jerabek
hyperbola |
| r1988 |
circumcenter,
De
Longchamps point, radical center |
