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siekluanh1092
2 năm trước
Cho tam giác ABC nội tiếp đường tròn (O) đường kính BC (AB>AC) tiếp tuyến tại A của đường tròn cắt BC tại D .F là điểm đối xứng của A qua BC. a.Chứng minh F thuộc (O) và DF là tieps tuyến b.H là hình chiếu của A trên BC . IH=IA. BI cắt (O) tại E .K là giao điểm của AF và BC.tính góc AEK=? c.DEcawts (O) tại P chứng minh P,O ,F thẳng hàng giúp mình vs tick 5* + 1 cảm ơn + 1 câu tlhn
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