| r1767 |
ninecenter,
Jerabek
hyperbola, perspective, pedal
triangle |
| r1771 |
Euler line |
| r1772 |
incenter |
| r1774 |
ninecenter,
orthic
triangle |
| r1776 |
isogonal
points |
| r1778 |
ninecenter,
altitude
feet, isogonal points, point
X(275) |
| r1784 |
circumcircle,
altitudes,
ninecircle |
| r1788 |
circumcevian
triangle,
perspective |
| r1790 |
perspective,
cevian
triangle, orthocenter |
| r1791 |
isogonal
points |
| r1792 |
homothetic triangles, inverse
points |
| r1795 |
incenter |
| r1796 |
orthocenter,
isogonal of the infinite point, circumconic |
| r1800 |
symmedian
point, point X(184) |
| r1801 |
centroid,
incenter,
excenters,
extangential
triangle,
parallelogic triangles |
| r1819 |
orthocenter,
altitude
feet, parallelogic triangles |
| r1822 |
Euler line,
orthic
triangle, parallelogic triangles |
| r1839 |
ninecircle,
tangential
triangle |
| r1864 |
ninecenter |
| r1866 |
ninecenter,
orthic
triangle,
altitudes,
orthocenter,
similar
triangles |
| r1871 |
ninecenter,
perspective,
similar
triangles |
| r1876 |
ninecenter,
complement,
antipedal
triangle |
| r1880 |
ninecenter,
orthocenter,
radical
center |
| r1885 |
circumcevian
triangle, circumcircle |
| r1888 |
isogonal
points, isogonal of the infinite
point |
