2001 IMO Shortlist Problems/G2
Problem
Consider an acute-angled triangle . Let
be the foot of the altitude of triangle
issuing from the vertex
, and let
be the circumcenter of triangle
. Assume that
. Prove that
.
Solution
This problem needs a solution. If you have a solution for it, please help us out by adding it. See 2001 IMO 1 page.