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thanhnghiemcong2002
2 năm trước
Cho tam giác ABC vuông tại A. Gọi M, N lần lượt là trung điểm của hai cạnh AB và BC. a) Gọi D là điểm đối cứng của A qua N. Chứng minh tứ giác ABCD là hình chữ nhật. b) Lấy I là trung điểm của cạnh AC và E là điểm đối xứng của N qua I. Chứng minh tứ giác ANCE là hình thoi. c) Đường thẳng BC cắt DM và DI lần lượt tại G và G’. Chứng minh BG = CG’. d) Cho AB = 6cm, AC = 8cm. Tính diện tích ΔDGG’.
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