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dinhvandung39
2 năm trước
Cho tam giác ABC vuông tại A có C 30°. Phân giác của DE vuông góc BC (E thuộc BC) a) Tính số đo góc ABC b) Chứng minh: DA= DE c) Chứng minh tam giác BDC là tam giác cân. M.n giúp tớ ạ Phân giác góc B cắc AC tại D kẻ, (bổ sung cho phần bị thiếu)
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