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nguyenconghungtb
2 năm trước
Cho tg ABC. Vẽ hai đoạn thẳng BI và CK dài bằng nhau và cùng vuông góc với BC sao cho I và K ở hai bên đường thẳng BC. IK cắt BC ở D. CM: 1) D là trung điểm của BC 2) Lấy điểm G trên AD sao cho AG = 2/3 AD. Điểm G là gì của tg ABC và tg AIK ?
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