cho tứ diện abcd gọi g1,g2,g3 lần lượt là trọng tâm các tam giác abc,acd,abd.tìm thiết diện cắt bởi (g1g2g3).tính diện tích thiết diện theo diện tích của tam giác bcd
Bạn xem ảnh để tìm đáp án nhé,$S_{td}=\frac 49\cdot  S_{\rm BCD}$

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