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khanhvanpnt456
2 năm trước
bài 1 cho tam giác ABC cân tại a đường phân giác của góc c cắt tại a AB và AC lần lượt tại m N biết ab bằng ac bằng 6 cm BC = 4 cm a chứng minh BN = cm b chứng minh MN song song với BC c tính độ dài AD dtính độ dài MN Bài 2 cho tam giác ABC vuông ở a đường cao là ah a chứng minh tam giác HAB đồng dạng với tam giác HCA b chứng minh AH^2 = HB.HC c.biết HB = 9 cm HC = 16 cm tính độ dài các cạnh của tam giác ABC
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