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2 năm trước
Từ điểm A nằm ngoài đường tròn (O) kẻ hai tiếp tuyến AB và AC tới (O), (B và C là tiếp điểm). Gọi H là giao điểm của AO và BC. a)Chứng minh 4 điểm A; O; B; C cùng thuộc đường tròn. b)Kẻ đường kính CD của (O), DA cắt (O) tại E (E khác D). CM OA vuông góc với BC và AE.AD = AH.AO. c)Gọi M là trung điểm của AC, BC cắt ME tại N. Cm ME là tiếp tuyến của (O).
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