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Hoangdanh2270
2 năm trước
Bài 5 : Cho tam giác ABC cân tại A có cạnh đáy BC = 6cm, đường cao AH = 4cm a) Chứng minh HB = HC b) Tính AB và AC. So sánh các góc của tam giác ABC c) Trên tia AH lấy điểm E sao cho H là trung điểm AE. Qua E vẽ đường thẳng vuông góc với AE, đường thẳng này cắt tia AC tại D. Chứng minh AC = CE = CD d) Vẽ trung tuyến CI của tam giác CDE. Gọi O là giao điểm của IH và EC. Đoạn thẳng AO cắt BC tại G. Chứng minh BC = 6HG
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