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tnhkb1971
2 năm trước
Bài 3. Cho đường tròn tâm O đường kính AB. Vẽ hai dây AM và BN song song với nhau sao cho sđcung BM <900. Vẽ dây MD song song với AB. Dây DN cắt AB tại E. Từ E vẽ một đường thẳng song song với AM cắt đường thẳng DM tại C. Chứng minh: a) AB  DN b) BC là tiếp tuyến của đường tròn (O).
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