<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


 

<Tri-2026-2369>, hint