Y by Adventure10
In a triangle
, let
and
be the feet of the angle bisectors of angles
and
, respectively. A rhombus is inscribed into the quadrilateral
(all vertices of the rhombus lie on different sides of
). Let
be the non-obtuse angle of the rhombus. Prove that 
Proposed by Dusan Djukic









Proposed by Dusan Djukic

This post has been edited 5 times. Last edited by mihajlon, May 22, 2015, 10:32 PM