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spass122
2 năm trước
Cho tam giác ABC. Trên nửa mặt phẳng bờ AB không chứa điểm C vẽ Ax vuông góc với AB. Trên nửa mặt phẳng bờ AC không chứa điểm B vẽ Ay vuông góc với AC. Lấy F thuộc Ax, H thuộc Ay sao cho AF=AB, AH=AC. D là trung điểm của BC. Chứng minh rằng: a) FH=2AD b) FH vuông góc với AD Em đang cần gấp mong các thầy, cô, anh, chị giúp với ạ
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