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thuynganl
2 năm trước
Cho nửa đường tròn tâm O đường kính MN, tiếp tuyến Nx. Qua A trên nửa đường tròn (A không trùng với M, N) kẻ tiếp tuyến với nửa đường tròn, cắt Nx tại B. Tia MA cắt Nx ở C. Chứng minh rằng: a) Bốn điểm O, A, N, B cùng thuộc một đường tròn. b) OB vuông góc AN. c) B là trung điểm của NC.
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