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nguyetuanh4106
2 năm trước
Đường tròn tâm O, dây AB=2a và khoảng cách từ dây AB đến tâm có độ dài bằng h. Gọi I là trung điểm của AB. Tia IO cắt đường tròn tại C a) Chứng minh tam giác ABC cân b) Tính khoảng cách từ O đến BC
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