| r1544 |
circumcircle,
tripolar,
isogonal
lines |
| r1558 |
circumcevian
triangle |
| r1563 |
orthocenter,
circumcenter |
| r1584 |
Euler line,
point
X(110), Parry reflection point |
| r1595 |
Brocard
line |
| r1609 |
incenter,
circumcenter,
incircle,
pedal
triangle |
| r1610 |
incircle,
Feuerbach
point, concyclic points |
| r1638 |
circumcevian
triangle,
perspective,
circumcenter,
point
X(376) |
| r1654 |
Gergonne
point, perspective |
| r1658 |
circumcircle,
altitude
feet |
| r1662 |
orthocenter,
altitudes,
excenters,
Euler
line |
| r1667 |
Fermat
points, antipedal triangle |
| r1668 |
tripolar,
Steiner
circumellipse,
cevian triangle, antimedial
triangle |
| r1669 |
tripolar,
Steiner
inellipse,
anticevian triangle |
| r1679 |
orthocenter,
cevian
circle, medians |
| r1680 |
orthocenter,
cevian
circle, medians, point
X(858) |
| r1681 |
orthocenter,
cevian
circle, medians, point
X(468), altitude feet |
| r1682 |
orthocenter,
cevian
circle, altitudes |
| r1683 |
orthocenter,
cevian
circle, altitudes, altitude
feet, point X(403) |
| r1684 |
orthocenter,
cevian
circle, altitudes, Euler
line |
| r1686 |
circumcircle,
similar
triangles |
| r1694 |
symmedian
point,
point X(125), isogonal
points |
| r1696 |
Thomsen
hexagon |
| r1697 |
Thomsen
hexagon |
