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Milkyvl
2 năm trước
o ∆ ABC cân tại A, AB = AC=10cm, BC= 12cm. Gọi K là trung điểm của BC. Chứng minh ∆ AKB = ∆ AKC và AK vuông góc với BC Kẻ phân giác AD của góc KAC( D thuộc BC). Kẻ DE vuông góc với AC( E thuộc AC). Chứng minh: ∆ KDE cân. Gọi G là trọng tâm của ∆ ABC. Tính độ dài AG. Chứng minh : AE + KC > AC
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