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thanht615
2 năm trước
Cho đường tròn (O) đường kính AB, gọi I là trung điểm của OA, dây CD vuông góc với AB tại I. Lấy K tùy ý trên cung BC nhỏ, AK cắt CD tại H. a) Chứng minh 4 điểm B, I, K, H cùng thuộc 1 đường tròn b) Chứng minh AH.AK có giá trị không phụ thuộc vị trí điểm K. c) Kẻ DN 1 CB, DM 1 AC. Chứng minh MN, AB, CD đồng quy.
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