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nguyenthuvan
2 năm trước
Cho tam giác ABC có AB=9cm,AC=12cm.Trên cạnh AB lấy điểm K,trên cạnh AC lấy điểm K sao cho AH=6cm,AK=8cm. a)chứng minh HK//BC b)cho biết BC=18cm.Tính HK c)Kẽ trung tuyến AM của tam giác ABC(M thuộc BC)AM cắt HK tại I.Chứng minh I là trung điểm của HK
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