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tn072180
2 năm trước
Cho $\triangle$ ABC vuông tại A có AB = 6cm, AC = 8cm. Kẻ đường cao AH a) Chứng minh $\triangle$ ABC $\backsim$ $\triangle$HBA b) Tính độ dài các cạnh BC, AH c) Phân giác $\widehat{ABC}$ cắt AH tại E, AB tại D. Tính tỉ số diện tích của 2$\triangle$ACD và HCE
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