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hoanggiang25394
2 năm trước
Cho đường tròn O; R đường kính AB. Vẽ dây AC sao cho góc CAB = 30°. Trên tia đối của tia AB lấy điểm M sao cho BM= R (Đã vẽ hình) Chứng minh: a) MC là tiếp tuyến của O b) MC = R√3
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