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namcrafter
2 năm trước
Cho ΔABC vuông tại A có AB = 6cm, AC = 8cm. Kẻ đường cao . a)Tính độ dài BC. b)Tia phân giác góc cắt cạnh BC tại D. Qua D kẻ . Chứng minh: ΔAHD = ΔAKD. c)Chứng minh: ΔBAD cân. d)Tia phân giác góc cắt cạnh BC tại E. Chứng minh AB + AC = BC + DE. Làm câu C,D
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