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hoangquanganhteols
2 năm trước
Cho tam giác ABC có AB=3cm,AC=4cm,BC=5cm a) Chứng minh tam giác ABC vuông tại A b)Tia phân giác của góc ABC cắt AC tại D.Kẻ DE vuông góc với BC tại E .Chứng minh DA=DE c) ED cắt AB tại F.Chứng minh ADF=EDC. GIÚP MÌNH VỚI Ạ HỨA CHO 5 SAO Ạ
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