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hankxtm
2 năm trước
Bài 1 (5 điểm): Cho tam giác đều ABC có AH vuông góc với BC tại H a) Chứng minh ∆AHB =∆AHC và tính ; b) Đường thẳng vuông góc với AB tại A cắt đường thẳng BC tại D. Trên cạnh AD lấy S sao cho AS=AH. Chứng minh ∆AHC =∆ASC ; c) Chứng minh S là trung điểm của AD. Bài 2 (5 điểm): Cho cân tại A có . Vẽ AH vuông góc với BC tại H. a. Chứng minh ; b. Trên nửa mặt phẳng bờ BC không chứa A, vẽ tia sao cho . Tia cắt đường thẳng AH tại . Tính ; c. Trên cạnh lấy điểm sao cho và cắt tại . Chứng minh DE vuông góc với AB
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