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trangdatx5
2 năm trước
giúp mk nha,mk cần gấp lắm Cho hình bình hành ABCD có BAD>90 . Vẽ AE vuông góc với đường thẳng CD tại E, AF vuông góc với BC tại F. a) Chứng minh: ∆AEF đồng dạng ∆BCA. b) Vẽ BH vuông góc với CD tại H, BK vuông góc với AD tại K. Chứng minh:góc BHK=góc DBC
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