| r1978 |
orthocenter,
isogonal
points, altitude feet, point
X(389) |
| r1980 |
orthologic
triangles, homothetic triangles |
| r1983 |
ninecenter,
altitude
feet,
Euler line, point
X(186) |
| r1984 |
symmedian
point,
altitude feet |
| r1988 |
De
Longchamps point, Euler line, radical
center |
| r1989 |
De
Longchamps point, Euler line, radical
center |
| r1990 |
orthocenter,
antigonal
points, circumcircle,
point
X(110), point X(265) |
| r1991 |
incenter,
excircles,
ninecenter |
| r1993 |
incenter,
ninecenter,
concyclic
points |
| r1994 |
incenter,
Euler
line |
| r1998 |
orthologic
triangles, ninecircle, Kosnita
point, point X(52) |
| r1999 |
incenter,
radical
center |
| r2004 |
incenter,
ninecenter,
cevian
quotient,
radical center |
| r2005 |
orthocenter,
ninecenter,
Euler
line,
cevian
quotient, radical center |
| r2008 |
ninecenter,
Euler
line,
tangential
triangle,
homothetic triangles |
| r2009 |
orthocenter,
ninecenter,
Euler
line,
excenters,
ninecircle |
| r2010 |
incenter |
| r2012 |
orthocenter,
isogonal
points,isotomic points |
| r2018 |
centroid,
altitude
feet, perspective,
Euler
line,
orthologic
triangles |
| r2020 |
altitudes,
Euler
line |
| r2021 |
altitudes,
Euler
line, complement,
altitude
feet, point X(74) |
| r2023 |
incenter,
ninecenter,
altitude
feet,
altitudes,
ninecircle,
point
X(52) |
| r2027 |
incenter,
ninecircle,
incentric
triangle,
point X(100),
isogonal
of the infinite point,
radical center |
| r2029 |
centroid,
Euler
line |
| r2030 |
centroid,
ninecenter,
medians |
