Advanced Geometric Problem & Solution (Twice a week update) Now 4846 problems posted.
<Cir-2026-806>, hint
<Cir-2026-806>, locus
<Spain MO 2009>
<Tri-2026-2366>, hint
<Tri-2026-2366>, general, center
<Spain MO 2007>
<Tri-2026-2365>, hint