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Cho tam giác ABC có AB = AC = BC, trên đường thẳng BC lấy điểm M và N ( khác B và C ) sao cho BM = AB, CN = AC. Nối AM, AN 1. Tam giác nào cân, tam giác nào đều? Vì sao? 2. Chứng minh tam giác ABM = tam giác ACN 3. Vẽ AH vuông góc BC ( H thuộc BC ), CK vuông góc AN ( K thuộc AN ). Chứng minh tam giác AHC = tam giác NKC
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