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tranvy04042001
2 năm trước
Ai giỏi hình giải giúp với ạaaaaaaa Cho ∆ABC vuông tại B. Biết BC = 15cm, BA = 8cm, trên cạnh BC lấy điểm E sao cho BE = BA. a) Tính AC b) ∆ ABE là ∆ gì? Vì sao ( cái này giải y như chứng minh luôn nha ) c) Từ B kẻ đường thẳng vuông góc với AE tại H và cách AC tại D. Cm : BD là tia phân giác góc ABC d) Gọi I là giao điểm của của AB và DE. Cm : AE // IC.
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