Bài 8 (0,5 điểm): Hình thang ABCD (AB // CD) có AB=3 cm, CD = 7 cm, AD= 10 cm. Gọi M là trung điểm của BC. Chứng minh rằng: AMD = 90°. giúp em bài 8 với ạ kèm hình em vote 5*

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