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lehuong05071972
2 năm trước
Cho hình ABCD ( AB>BC ). Gọi E đối xứng với B qua A, F đối xứng với B qua C. a) E,D,F thẳng hàng. b) Kẻ EF vuông góc với BH tại H. Gọi P và Q là hình chiếu của H trên AB và AC. Chứng minh: BPHQ là hình gì ? Vì sao ? c) BD vuông góc với PQ
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