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小升初数学：怎么求阴影部分面积？已知弧长，怎么求圆心角度数？
小升初数学：怎么求阴影部分面积？已知弧长，怎么求圆心角度数？
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167/233
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