



Sử dụng định lý Stewart trong tam giác CBD với đường trung tuyến CM (M là trung điểm BD), sau đó áp dụng tính chất trọng tâm
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cho tứ diện abcd g là trọng tâm tam giác abd
- CG song song với đường cao
- Không có công thức trực tiếp
- Trung điểm CD
- Trung điểm của AI
- 3V/4 Cho tứ diện ABCD. Gọi G là trọng tâm tam giác ABD. Nếu điểm M thỏa mãn $\overrightarrow{MC} = \frac{1}{3}(\overrightarrow{MA} + \overrightarrow{MB} + \overrightarrow{MD})$, thì M là điểm nào?
- G là tâm đường tròn ngoại tiếp, nội tiếp, trực tâm của tam giác ABD
- Có, tất cả các đường
- Một điểm duy nhất (G)
- Có đường trung tuyến BG vuông góc với AD
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