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Yumiko
2 năm trước
Cho tam giác ADC cân tại A. Kẻ AE vuông góc với DC ( EDC ) a) Chứng minh: AED =  AEC b) Giả sử AD = AC = 5cm, DC = 8cm. Tính độ dài AE c) Trên tia đối của tia EA lấy điểm M sao cho EM = EA. Chứng minh  ADM cân d) Chứng minh DM // AC
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