CEVA’S AND MENELAUS’ THEOREMS FOR TETRAHEDRA (II)

@article{Witczyski1996CEVASAM,
  title={CEVA’S AND MENELAUS’ THEOREMS FOR TETRAHEDRA (II)},
  author={Krzysztof Witczyński},
  journal={Demonstratio Mathematica},
  year={1996},
  volume={29},
  pages={233 - 236}
}
The paper is a continuation of an earlier article [5] concerning spatial versions of the well known theorems of Ceva and Menelaus. A necessary and sufficient condition for six points lying on edges of a given te t rahedron to be ( oplanar is formulated. Similarly, a necessary and sufficient condition for six planes, each of them determined by an edge and the point on the opposi te edge, to have a common point is s ta ted. 

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