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lild2950
1 năm trước
cho tam giác ABC cân tại A AH vuông góc với BC a) C/m AH là tia phân giác của hóc BAC b) Trên cạnh BC lấy điểm D ( D khác H) trên tia đối CB lấy điểm E sao cho CE = BD các đường thảng vuông góc với BC kẻ từ D và E cắt AB AC lần lượt tại M và N . C/m MD= EN c) MNcắt BCtại i . C/ m I là trung điểm của de d) đường thảng vuông góc với MN tại I cắt tia AH tại O . C/m tam giác OMN cân e) C.m OC vuông góc với AC
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