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Hiennguyen19
2 năm trước
Cho đường tròn O và đường thẳng d đi qua đường tròn nhưng không qua O Lấy d cắt O tại hai điểm A,B . chọn điểm M thuộc O nằm ngoài đoạn AB kẻ MC,MD là tiếp tuyến của (O), ( C,D thuộc (O) ) Kẻ hai tiếp tuyến của (O) cắt (O) tại A,B giao điểm hai tiếp tuyến đó là I CMR I,C,D thẳng hàng
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