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luuthanhhien2001
2 năm trước
Cho đường tròn (O) đường kính bằng 8cm và điểm A sao cho OA = 8cm. Vẽ tiếp tuyến AB với đường tròn (O) (B là tiếp điểm). Vẽ dây BC vuônng góc với OA tại I. a) Tính độ dài AB, BI. b) Chứng minh rằng: AC là tiếp tuyến của đường tròn (O). c) Đoạn OA cắt đường tròn (O) tại M. Qua M vẽ tiếp tuyến với đường tròn (O), tiếp tuyến này cắt AB và AC lần lượt tại D và E. Tính số đo DOE
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