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anhkai
2 năm trước
Cho tam giác ABC cân tại A.kẻ AH vuông góc với BC (H e BC) a/chứng minh ∆AHB=∆AHC b/chứng minh BAH^=CAH^ c/trên tia đối của tia HA lấy điểm D sao cho HA=HD.chứng minh tam giác CAD là tam giác cân d/tìm điều kiện của tam giác ABC để CAD^=30°
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