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Vannho123
2 năm trước
Cho tam giác abc vuông tại B. Có góc A=60 độ.Ab=5cm, Ae là ti phân giác của góc BAC. Kẻ ed vuông góc với ac. Chứng minh. a)so sánh 3 cạnh của tam giác abc b) chứng minh tam giác abe=tam giác ade c) chứng minh tam giác abd đều d) chứng minh d là trung điểm Ac. Từ đó tính độ dài Ac?
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