問題詳情
21.如圖(十)，△ABC的內部有一點P，且D、E、F是P分別以 
為對稱軸的對稱點。若△ABC的內角∠A＝70∘，∠B＝60∘，∠C＝50∘，則∠ADB＋∠BEC＋∠CFA＝？圖(十) 
(A) 180∘
(B) 270∘
(C) 360∘
(D) 480∘
為對稱軸的對稱點。若△ABC的內角∠A＝70∘，∠B＝60∘，∠C＝50∘，則∠ADB＋∠BEC＋∠CFA＝？圖(十) (A) 180∘
(B) 270∘
(C) 360∘
(D) 480∘
參考答案
答案：C
難度：簡單0.75
統計：A(3),B(3),C(21),D(1),E(0)
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