olymmath

BALKAN 2024 Problem 1

  • Paper

Let ABCA B C be an acute-angled triangle with AC>ABA C>A B and let DD be the foot of the AA-angle bisector on BCB C. The reflections of lines ABA B and ACA C in line BCB C meet ACA C and ABA B at points EE and FF respectively. A line through DD meets ACA C and ABA B at GG and HH respectively such that GG lies strictly between AA and CC while HH lies strictly between BB and FF. Prove that the circumcircles of △EDG\triangle E D G and △FDH\triangle F D H are tangent to each other.

Dataset text NuminaMath olympiads. Quoted with source.

Solutions

No solution is on olymmath yet. Official and human solutions come first when they arrive. AI solutions come after them, with a label.

Add a solution

Locator balkan/2024/p1 · Tag B2KM5Z8SPE · Edit this page on GitHub · Keys: j next, k previous