<Tri-2026-2371>, general, bisector

<Spain MO 2015>

 

<Qua-2026-831>, hint

 

<Qua-2026-831>, general, cyclic

<Spain MO 2013>

 

<Tri-2026-2370>, hint

 AH=2R cosA, OM=RcosA, AO//MN

<Tri-2026-2370>, general. locus