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phuonglan
2 năm trước
Cho hình thang ABCD có đáy AB (AB<CD) các đường thẳng chứa hai cạnh bên cắt nhau tại E biết AB = 25cm, CD = 40cm, chiều cao hình thang là 12cm. a) Tính khoảng cách từ E đến AB b) Biết S tam giác EAH = 54cm2. Tính S tam giác ADI c) Giả sử MN chia hình thang thành 2 phần có diện tích bằng nhau và MN//AB//DC ( M thuộc AD, N thuộc BC) Chứng minh : ( AB^2 + CD^2 )/MN^2 = 2 ( hình vẽ mình đính kèm ở dưới, cảm ơn mọi người nhiều ạ)
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