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hoaphuong23305
2 năm trước
Cho đường tròn (O; R), dây AB cố định (AB < 2R). Từ điểm M trên cung nhỏ AB (M không trùng với A và B) kẻ dây MN vuông góc với AB tại H. Gọi I, K lần lượt là chân của các đường vuông góc kẻ từ M đến AN và BN. a) Chứng minh: NI.NA = NH.NM. b) Chứng minh: MN là tía phân giác của góc BMI.
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