✨ Best Answer ✨
∠BOA＝34×2＝68°
∠OBC＝90－68＝22°
∠DBC＝41＋22＝63°
∠DOC＝63×2＝126°
弧CD＝円周×126/360
＝20π×7/20
＝7π
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