Advanced Geometric Problem & Solution (Twice a week update) Now 4835problems posted.
<Qua-2026-828>, hint
<Qua-2026-828>, general, area
<Spain MO 1997>
<Qua-2026-827>, hint
<Qua-2026-827>, square, area
<Spain MO 1998>
<Polygon-2026-281>, hint2
