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nguyenminhbach9696@gmail.com
2 năm trước
Cho hình bình hành ABCD có AB=2 AD.Goi E,F lần lượt trung điểm AB, CD ; AF cắt DE tại G ; CE cắt BF tại H a) Chứng minh :AF // CE và DE là phân giác ADC b) Chứng minh : EGFH là hình chữ nhật c) Tìm điều kiện hình bình hành ABCD để EF vuông góc GH
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