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hadu20112001
2 năm trước
Cho tam giác ABC vuông tại A có AB = 6cm, AC = 8cm. Gọi M là trung điếm của cạnh AB, N là trung điếm của cạnh AC. a) Tính độ dài đoạn thẳng MN. b) Gọi D là trung điểm của cạnh BC. Chứng minh tứ giác BMND là hình bình hành. c) Chứng minh tứ giác AMDN là hình chữ nhật. d) Gọi E là điếm đối xứng với D qua M. tứ giác BDAE là hình gì? Vì sao? Toán hình lớp 8 cần gấp
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