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如图,扇形纸扇完全打开后,外侧两竹条AB,AC夹角为120°,AB的长为30cm...
如图,扇形纸扇完全打开后,外侧两竹条AB,AC夹角为120°,AB的长为30cm,贴纸部分BD的长为20cm,则贴纸部分的面积为( )
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A.100πcm
2B.
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πcm
2C.800πcm
2D.
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πcm
2
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