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kieu020620
2 năm trước
Cho tam giác ABC vuông tại A. Vẽ AH vuông góc với BC (H thuộc BC). a) Cho AB = 6 cm, và BC = 10 cm, tính cạnh AC? b) Lấy điểm D thuộc tia đối của tia HA sao cho HD = HA. Chứng minh rằng tam giác AHC = tam giác DHC và suy ra tam giác ACD cân. c) Tính số đo của góc BDC Ai giải giúp em vs ạ cho 5 sao và hay nhất
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