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2 năm trước
Câu 1: ( 1 điểm ) Cho hình vẽ. Biết tam giác ABC vuông tại A, độ dài cạnh bằng 7cm, cạnh AB=x(cm) và cạnh huyền BC=x+1(cm) . Em hãy tìm độ dài cạnh huyền BC của tam giác . Câu 2: ( 1,5 điểm ) Cho hình thang cân ABCD (AB // CD, AB > CD) có A ̂+B ̂=1/2(C ̂+D ̂). Đường chéo AC vuông góc với cạnh bên BC. (vẽ hình) a) Tính các góc của hình thang. b) Chứng minh AC là phân giác của góc (DAB) ̂
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