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Jonathansgod
2 năm trước
Cho đoạn thẳng BC. Gọi I là trung điểm của BC. Trên đường trung trực của BC lấy điểm A (A khác I) 1. Chứng minh tam giác AIB = tam giác AIC. 2. Kẻ IH vuông góc với AB, kẻ IK vuông góc với AC. a) Chứng minh tam giác AHK cân. b) Chứng minh HK//BC.
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