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2 năm trước
Câu1:Cho tam giác MNP có MN =12cm ,NP=5cm,MP=13cm Chứg minh tam giác MNP là tam giác vuông Câu 2: Cho tam giác DEG có DE =12cm,DG=9cm,EG=15cm . Chứg minh tam giác DEG là tam giác vuông Câu 3: Cho tam giác ABC vuông tại C, có góc A =60° và đườg p.giac của góc BAC cắt BC tại E ,kẻ EK vuông góc vớii AB tạii K ( K thuộc AB ),kẻ BD vuông góc AE tại D ( D thuộc AE).c/m a,t.giac ACE = t.giac AKE b,t.giac EBA cân c,giả sử AB=5cm ,AC = 3cm . Tính độ dài cạnh BC d,Tia BD và tia AC cắt nhau ở F .c/m 3 điểm FEK thẳg hàng
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