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每天一道初中数学压轴题：直角三角形、相似三角形和圆的切线判定
每天一道初中数学压轴题：直角三角形、相似三角形和圆的切线判定综合题，中等难度。每天做一道初中数学压轴题，为中考加油！
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143/233
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