

Tam giác CAD cân tại C
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cho tứ diện abcd g là trọng tâm tam giác abd
- Không có cách kiểm tra trực tiếp Cho tứ diện ABCD. Gọi G là trọng tâm tam giác ABD. Nếu tam giác ABD có trực tâm H, có mối quan hệ nào giữa G và H không?
- Sh/9
- GI
- CG nằm trong (ABD)
- Không có mối quan hệ tổng quát
- \overrightarrow{LA} + \overrightarrow{LB} + \overrightarrow{LD}
- C, G, M
- G là trung điểm của AH
- Đường trung tuyến AM của tam giác ABD
- $\overrightarrow{3MG}$ Cho tứ diện ABCD. Gọi G là trọng tâm tam giác ABD. Nếu có một mặt phẳng $(\alpha)$ chứa CG và vuông góc với đường thẳng AB, thì có kết luận gì về mối quan hệ giữa CG và AB?
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