問題詳情
7.如右圖，△ABC 為正三角形，D 點、E 點與 F 點分別為 
與 
的中點，則△DEF 內切圓半徑：△ABC 外接圓半徑的比值為何? 
(A) 
(B) 
(C) 
(D) 
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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