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nhok0162
2 năm trước
Bài 5: Cho tam giác ABC có ba góc nhọn ( AB < AC ), gọi AH là đưong cao. Kè HM vuông góc với AB tại M và kẻ HN vuông góc với AC tại N. a) Chứng minh tam giác AHM đồng dạng với tam giác ABH. b) Biết rằng AH = 8 cm và HB = 6 cm. Tính đo dài doạn thẳng AM c) Trên tia đối của tia NM lấy điểm E sao cho AEN = ACE. Chứng minh tam giác AHE là tam giác cân. com
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