Y by
Let
be the center of the circle inscribed in the acute triangle
. The symmetric point of
wrt side
lies on the circumcscribed circle of the triangle
. Prove that
, where
is the intersection point of the altitudes of triangle
.








This post has been edited 1 time. Last edited by parmenides51, Aug 20, 2021, 2:37 PM
Reason: latex
Reason: latex