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theuluu7
2 năm trước
Giúp vs ạ mik cần ngay gấp ạ ...😥 Cho (O,R) và một điểm A nằm trong đường tròn. Qua A kẻ tiếp tuyến AB của đường tròn(B là tiếp điểm).Vẽ Ax nằm giữa AB và AO cắt (O,R) tại hai điểm C và D(C nằm giữa A và D). Gọi M là trung điểm của CD, kẻ BH vuông góc với AO tại H a, CM:A,B,M,O cùng thuộc một đường tròn b, Gọi I là giao điểm của AD với HB.CM:AC.AD=AI.AM c,CM tứ giác CHOD nội tiếp
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