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phiuen22
2 năm trước
Cho tam giác ABC cân tại A. trên cạnh AB lấy điểm D. Trên cạnh AC lấy điểm E sao cho AD=AE a) C/M rằng BE=CD. b) C/M rằng góc ABE = góc ACD c) Gọi k là giao điểm của BE và CD. Tam giác KBC là tam giác gì? vì sao? d) Ba đường thẳng AC,BD,KE cùng đi qua một điểm.
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