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九年级数学：三角形相似和求圆的半径有什么关系？还是勾股定理！
九年级数学：三角形相似和求圆的半径有什么关系？还是勾股定理！
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121/233
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