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tangochoangvu
2 năm trước
Cho nửa đường tròn O bán kính R đường kính AB Ax và By là hai tiếp tuyến của O tại các tiếp điểm A B lấy M bất kì trên nửa đường tròn m khác A và B tiếp tuyến của O tại điểm M cắt hai Ax By lần lượt tại các điểm C và D Chứng minh BM D là tứ giác nội tiếp b với AC = căn 3 r Hãy tính độ dài đoạn thẳng BM theo giờ C nối AD cắt BM tại p kẻ MN vuông góc với AB E thuộc AB Chứng minh rằng đường tròn ngoại tiếp tam giác MNP luôn đi qua một điểm cố định
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