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nguyenvancu03021970
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VẼ HÌNH THÔI NHÉ ( THÍCH THÌ LÀM HẾT CX ĐC ) Bài 4 : Cho tam giác ABC cân tại A ( Góc A < 90 độ ) ; các đường cao BD ; CE ( D thuộc AC ; E thuộc AB ) cắt nhau tại H . a) Chứng minh tam giác ABD = tam giác ACE b) Tam giác BHC là tam giác j ? Vì sao ? c) So sánh HB và HD ? d) Trên tia đối của tia EH lấy điểm N sao cho NH < HC ; trên tia đối của tia DH lấy điểm M sao cho MH = NH . Chứng minh các đường thẳng BN ; AH ; CM đồng quy
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