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mt9150820
2 năm trước
Cho tam giác ABC vuông tại A,AB=6cm,AC=8cm,lấy O là trung điểm của BC a)Tính BC,AO b)Vẽ D đối xứng A qua O.Chứng minh tứ giác ABDC là hình chữ nhật c)Trên đoạn OC lấy điểm M(M khác O và C).Vẽ N đối xứng với D qua M.Chứng minh tứ giác ABCN là hình thang
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