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emtien01
2 năm trước
Cho  ABC vuông ở A ; AB = 6 cm ; AC = 8 cm a) Tính BC ; góc B và góc C b) Phân giác của góc A cắt BC tại D c) Từ D kẻ DE vuông góc với AB và DF vuông góc với AC (E thuộc AB, F thuộc AC). Tứ giác AEDF là hình gì? Tính chu vi và diện tích của hình tứ giác đó?
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