Advanced Geometric Problem & Solution (Twice a week update) Now 4632 problems posted.
<Tri-2025-2230>, hint
Triangles DOB and OBC are similar
BD/BO=BO/BC, BC=2R sinA , which gives A=60
Triangles ABC and DAC are similar, DC/AC=AC/BC, AC=2RsinB, which
gives ,B=45.
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