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ctvloga121
2 năm trước
cho nửa đường tròn tâm O đường kính AB = 2R .Trên nữa đường tròn ấy lấy điểm C khác A và B .Kẻ OK vuông góc với BC tại K , D là giao điểm của BC với tiếp tuyến tại A của nửa đường tròn tâm O và I là trung điểm của AD. Cm : OK//AC , BC.BD=4R^2 , IC là tiếp tuyến của đường tròn tâm O
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