Advanced Geometric Problem & Solution (Twice a week update) Now 4760 problems posted.
<Cir-2026-800>, hint
Since CPQ is isosceles PQ ㅗCO (O;enter of circle ABC) Triangles CLA and CNA are congruent (KAxKC=KPxKQ=KLxKN, A,N,C,L are concyclic <CLA=<CNA=90,CL=CN, AC common)
<COB=2<CAB=<LAB hence AL//CO and COㅗPQㅗAL
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