Y by
For some triangle, define its Ninja Point as the point on its circumcircle such that its Steiner line coincides with the Euler line of the triangle. For an triangle
, define:
Points
,
and
are collinear, that is
is the Feuerbach point.
Points
,
and
are collinear

as its circumcentre,
as its orthocentre and
as its nine-point centre.
,
and
to be the midpoint of the smaller arcs.
as the isogonal conjugate of the Nagel point (i.e. the exsimillicenter of the incircle and circumcircle)
as the ninja point of
as the ninja point of the contact triangle








