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toilanam193
2 năm trước
Cho tam giác ABC cân tại A. Trên tia đối của tia BA lấy điểm D, trên tia đối của tia CA lấy điểm E sao cho BD=CE. Vẽ DH và EK cùng vuông góc với đường thẳng BC. Chứng minh a. HB=CK b.góc AHB=góc AKC c.HK song song với DE d.tam giác AHE= tam giác AKD e.gọi I là giao điểm của DK và EH chứng minh AI vuông góc với DE
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