: Cho vuông tại A.Biết AB=6cm ,AC=8cm. a)Tính BC. b)Tia phân giác của góc B cắt cạnh AC tại D. Kẻ DE BC (E BC).Gọi K là giao điểm của tia ED và đường thẳng AB. Chứng minh: c)Chứng minh :tam giác KDC cân. d) Kẻ AH CK (H CK) và tia BD cắt CK tại I. Chứng minh AH //BI

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