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20 1 1 Anhui senior high school entrance examination mathematics multiple-choice question 7 has a process.
Solution: connect OB and OC, as shown in the figure,

∫∠BAC = 36，

∴∠BOC=2∠BAC=72

72? π? 12π

Is the arc bad? Length of BC =? ——————? =—————

1805

So choose B.

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