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Truongvip1hn
2 năm trước
Cho tam giác nhọn ABC (AB<AC). Vẽ đường tròn (O) đường kính BC cắt các AB,AC thứ tự tại các điểm E và D; BD cắt CE tại H; AH cắt BC tại I. Vẽ tiếp tuyến AN với đường tròn (O) (N là tiếp điểm và N thuộc cung nhỏ DC) a) Chứng minh ABID là tứ giác nội tiếp. b) Chứng minh AN² = AD . AC = AH . AI c) Kẻ tiếp tuyến AM với đường tròn (O) (M là tiếp điểm, M . Chứng minh 3 điểm M,N,H thẳng
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