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taracooky
2 năm trước
Cho tam giác ABC có AC=3cm, AC=4cm,BC=6cm a) Chứng minh tam giác ABC vuông. Tính góc B, C b) Phân giác của góc A cắt BC tại D. Tính BD, CD c) Từ D kẻ DE và DF vuông góc với AB, AC. Tứ giác AEDF là hình gì? Tính chu vi tứ giác AEDF
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