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初中数学：90度的扇形，正方形面积是20，怎么求阴影部分的面积？
初中数学：90度的扇形，正方形面积是20，怎么求阴影部分的面积？
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162/233
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