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2 năm trước
Cho điểm M nằm ngoài đường tròn (O). Từ M vẽ hai tiếp tuyến MA; MB (A; B là các tiếp điểm) và một cát tuyến MCD (C nằm giữa M và D; C và A nằm cùng phía với đường thẳng OM). a) Chứng minh: tứ giác MAOB nội tiếp b) Chứng minh: MA2 = MC . MD c) Vẽ đường kính AE, CE và DE lần lượt cắt OM tại K và F. Chứng minh : OK = OF
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