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vhdao199
2 năm trước
Cho hình thang ABCD (AB//CD) Gọi M,N,P,Q làn lượt là trung điểm của AB,BC,CD,DA a) Tứ giác MNPQ là hình gì? vì sao b) Hai đường chéo của hình thang ABCD thoã mãn điều kiện gì thì MNPQ là hình chữ nhật? Trong trường hợp đó, hãy tính độ dài MP biết AB=3cm CD=5cm?
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