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smeb492000
2 năm trước
Cho tam giác ABC cân tại A, kẻ BD vuông góc với CE vuông góc với AB a) kiên chứng minh BD=CE b) Trên tia đối của tia BD lấy điểm I, trên tia đối của tia CE lấy điểm K sao cho vừa BI= CK. Chứng minh : tam giác ABI bằng tam giác ACKq c) Tam giác AIK là tam giác gì? Vì sao?
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