请问如何证明:如果四面体的内切球与每个面的切点都是这个面的重心,那么这个四面体是正四面体? 知乎 Template




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tomski请问如何证明:如果四面体的内切球与每个面的切点都是这个面的重心,那么这个四面体是正四面体? 知乎 coloring