問題詳情
5. 自圓外一點A，作圓O的兩切線，切點分別為B、C兩點，則下列敘述何者錯誤？
(A) 
(B) A、B、C、O 四點共圓
(C)∠ABO=90°
(D) 
垂直平分 
參考答案
無參考答案
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