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trinhkelong
2 năm trước
Cho tam giác ABC có AB=AC. Tia phân giác của góc BAC cắt cạnh BC tại M. Từ M kẻ MH vuông góc với AB tại H (H thuộc AB).Từ M kẻ MH vuông góc với AC tại K (K thuộc AC) a) Chứng minh tam giác AMB=tam giác AMC b) Chứng minh tam giác AMH=tam giác AKM từ đó so sánh hai đoạn thẳng AH và AK c)Chứng minh HK vuông góc AM
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