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ngocminhhh
2 năm trước
Cho ΔABC cân ở A (∠A < 90độ). Vẽ BH ⊥ AC (H ∈ AC), CK ⊥ AB (K ∈ AB). a) Chứng minh rằng AH = HK b) Gọi I là giao điểm của BH và CK. Chứng minh rằng AI là tia phân giác của góc A c) Chứng minh AI ⊥ BC. d)Chứng minh AI đi qua trung điểm của BC. Giúp mik nhé ,mik sắp phả nộp rồi!
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