Y by
Let
be a median in an acute-angled triangle
. A point
is chosen on the line through
tangent to the circumcircle of
so that
. The segments
and
meet at
. Prove that the circumcenter of
lies on the line
.
Aleksandr Kuznetsov, Russia











Aleksandr Kuznetsov, Russia
This post has been edited 3 times. Last edited by parmenides51, Oct 9, 2020, 12:31 PM
Reason: source edit
Reason: source edit