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lanxinhgai121
2 năm trước
Bài 3: (3đ) Cho tam giác ABC vuông tại A (AB < AC), đường cao AH (H thuộc BC). Kẻ HD vuông góc AB tại D và HE vuông góc vs AC tại E. a) Chứng minh: Tứ giác ADHE là hình chữ nhật. (1đ) b) Gọi F là điểm đối xứng của điểm H qua điểm E. Chứng minh: Tứ giác ADEF là hình bình hành. (1đ) c) Gọi M là trung điểm của BC. Chứng minh: AM vuông góc vs AF. Nhớ vẽ hình nha mn
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