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從圓外一點引圓的兩條切線,它們的切線長相等,圓心和這一點的連線,平分兩條切線的夾角. 從圓外一點引圓的兩條切線指過這點分別作與圓相切的兩條切線(兩邊都有一條),說白了就是與過切點的半徑垂直的兩條直線
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