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huynhquockhanh1333
2 năm trước
Bài 4. Cho tam giác ABC cân tại A, đường cao AH (H thuộc BC). a. Chứng minh tam giác AHB= tam giác AHC. b. Từ H kẻ đường thắng song song với AC, cắt AB tại D. Chứng minh AD=DH c.Goi E là trung điểm AC, CD cắt AH tại G. Chứng minh B, G, E thắng hàng. giúp mình với mình cần gấp bài này
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