問題詳情
5.如右圖，圓 O1 與圓 O2 外切於點 A，為其外公切線， 
為切點，若兩圓的半徑分別為 6.3則 
＝？
(A) 66
(B) 68
(C) 70
(D) 72
參考答案
無參考答案
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