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gialinh2001
2 năm trước
Cho nửa (O,R), đường kính AB, tiếp tuyến Ax . Trên Ax lấy AK=R. Đường tròn tâm K bán kính R cắt KB ở I. Đường tròn tâm B bán kính IB cắt (O) ở E. Tia BE cắt Ax ở C. CMR: Đường trung trực của BC là tiếp tuyến của (O)
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