MathDB

12

Part of 1992 IMO Longlists

Problems(1)

Short and nice problem, Prove that ABC is acute-angled

Source:

9/1/2010
Given a triangle ABCABC such that the circumcenter is in the interior of the incircle, prove that the triangle ABCABC is acute-angled.
geometrycircumcircleincircleIMO ShortlistIMO Longlist