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bts203
2 năm trước
Cho tam giác ABC nội tiếp trong đường tròn (O). AD là tia phân giác của góc A. (D thuộcBC). Gọi E là giào điểm của AD với đường tròn (O). a) Tiếp tuyến của đường tròn tại A cắt BC ở I. Chứng minh rằng tam giác IAD là tam giác cân. b) Kẻ đường kinh EOF. Gọi M là giao điểm của FA với BC. Chứng minh rằng M đối xứng với D qua l..
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