87. Suppose point O point is the center of an excircle of the acute triangle △ ABC. If∠ =° BAO 30 ,
問題詳情
87. Suppose point O point is the center of an excircle of the acute triangle △ ABC. If∠ =° BAO 30 , what is ∠ACB ? (A) 40 ° (B) 45 ° (C) 50 ° (D) 60 °16