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Hoholele01
2 năm trước
Cho tam giác ABC cân tại A có AB=AC=13,BC=24.Kẻ AH vuông góc BC(H thuộc BC) a,chứng minh tam giác AHC=AHB b,Tính độ dài AH c, trên tia đối của tia BC lấy điểm K,trên tia đối của tia CB lấy điểm I sao cho BK=CI,chứng minh tam giác ABK=ACI d,Kẻ BM vuông góc AK,CN vuông góc AI,Chứng minh tam giác MBK=NCI
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