問題詳情
15. 如圖(十五)， D 為 
上一點，且∠ADC＝∠ACB，若 
＝3，則 
的長度為何？
(A)2
(B) 2.25
(C) 2.5
(D) 3
參考答案
答案：C
難度：計算中-1
書單：沒有書單，新增
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