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manhquyet05
2 năm trước
Bài 5:Cho tam giác ABC cân tại A. Kẽ Ai vuông góc BC , I BC. a) C mr: I là trung điểm của BC. b) Lấy điểm E thuộc AB và điểm F thuộc AC sao cho AE = AF. Chứng minh rằng: IEF là tam giác cân. c) Chứng minh rằng: EBI = FCI. Bài 6 Tam giác ABC có phải là tam giác vuông hay không nếu các cạnh AB; AC; BC tỉ lệ với 9; 12 và 15
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