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Huongly00
2 năm trước
Cho tam giác ABC cân tại A có AH là đường cao và BC = 4,2 cm ; AH = 1,7 cm a) Tính AB và góc B b) Từ H kẻ HD vuông góc AB tại D . Tính HD c) Từ H kẻ HE vuông góc AC tại E Chứng minh rằng: AD.AB=AE.AC ( vẽ luôn hình cho mình nha)
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