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九年级数学：怎么求证圆的切线，和三角形相似？2021株洲中考数学
九年级数学：怎么求证圆的切线，和三角形相似？2021株洲中考数学
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189/233
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