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mjnhsasa
2 năm trước
Cho hình chữ nhật ABCD. Qua B kẻ đường thẳng vuông góc với đường chéo AC tại H. Gọi E, F, G theo thứ tự là trung điểm của AH, BH, CD. 1) Chứng minh tứ giác EFCG là hình bình hành. 2) Chứng minh BEG=90° 3) Cho biết BH=H, góc BAC=a. Tính S của ABCD theo h và a. 4) Tính độ dài đường chéo AC theo h và a
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