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九年级数学：怎么求阴影部分面积？圆的计算题，圆心角圆周角定理
九年级数学：怎么求阴影部分面积？圆的计算题，圆心角圆周角定理
初中数学，圆的计算和证明，垂径定理，圆周角圆心角，切线，扇形165/233
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