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nguyenvanthanhkbang37
2 năm trước
Bài 4: Cho tam giác ABC vuông tại A ( AB < AC), trên cạnh BC lấy điểm D sao cho BD = BA. Gọi H là trung điểm của đoạn thẳng AD. a/ Chứng minh : △ ABH = △ DBH b/ Chứng minh: BH vuông góc AD c/ Qua B vẽ đường thẳng song song với AD, qua A vẽ đường thẳng song song với BH, hai đường thẳng này cắt nhau tại M. Chứng minh : AM = BH.
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