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2018株洲中考25题，圆切线证明，圆中三角形相似，求OH+CH最大值
2018株洲中考25题，圆切线证明，圆中三角形相似，求OH+CH最大值
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113/233
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