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chungaries1991
2 năm trước
Bài 7. Cho tam giác ABC nhọn (AB < AC). Kẻ AH vuông góc với BC (H∈ BC). Trên tia đối của tia HA lấy điểm M sao cho H là trung điểm của AM. a) Chứng minh : ∆ABH = ∆MBH b) Chứng minh : GÓC 𝐵̂𝐴𝐶 = GÓC 𝐵̂𝑀𝐶 c) Gọi I là trung điểm của BC. Trên tia đối của tia IA lấy điểm N sao cho I là trung điểm của AN. Chứng minh NC = MB. d) Cho AB = 13cm, AH = 12cm, HC = 16cm. Tính AC ; BC.
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