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myhanh041001
2 năm trước
1/ Cho hình thang cân ABCD ( AB // CD ), AB = 4cm, CD = 14cm, BC = 13cm. Tính BD. 2/ Cho hình thang ABCD( AD//BC; AD>BC) đường chéo AC vuông góc với cạnh bên CD góc BAC bằng góc CAD và góc D bằng 60 độ a) CMR: ABCD là hình thang cân b) Tính độ dài cạnh đáy AD biết chu vi hình thang bằng 20 cm MÌNH CẦN GẤP AH!!!!!!!!!!
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