,
.
,
,
with 
,
,
,
and lines 
and 
intersect at 
.
and 
intersect again at 
.
and 
intersect the circumcircle of triangle 
again at 
and 
,
lies on 
.
for which
(use in a problem for junior) to practice. Can anyone share to me?
Y by Adventure10
In triangle 
the altitude 
is drawn. The line that is symmetric to the altitude drawn from vertex 
about line intersects line 
at point 
. Find angle 
, where 
is the center of the circle circumscribed about triangle (the points , 
, and are all distinct).
the altitude 
is drawn. The line that is symmetric to the altitude drawn from vertex 
about line intersects line 
at point 
. Find angle 
, where 
is the center of the circle circumscribed about triangle (the points , 
, and are all distinct).
