Áp dụng định lý Stewart mở rộng
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Shipping and Returns Policy
- Deliver to United States » Shipping Policy «
- - Shipping Cost: $5.99
- - Handling time: 2-3 business days
- - Transit time: 7-10 business days
- Eligible for » Returns & Refund Policy « within 30 days from the date of delivery
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cho tứ diện abcd g là trọng tâm tam giác abd
- Sử dụng tỉ lệ trên đường trung tuyến
- 1 2
- Lấy trung bình cộng tọa độ tương ứng của A, B, D
- G là một đỉnh của hình hộp
- \overrightarrow{NA} + \overrightarrow{NB} + \overrightarrow{ND}
- Đường trung tuyến từ C của tam giác CBD song song với AB
- BC Cho tứ diện ABCD. Gọi G là trọng tâm tam giác ABD. Tìm giao tuyến của mặt phẳng (ACG) và mặt phẳng (BDG).
- Không có công thức trực tiếp
- $\overrightarrow{PG} = \overrightarrow{PA} + \overrightarrow{PB} + \overrightarrow{PD}$
- G song song với $(\beta)$
-
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