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A Geometrical Proof of a Theorem connected with the Tetrahedron


1. The six planes through the middle points of the edges of a tetrahedron perpendicular to the opposite edges are concurrent.

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Proceedings of the Edinburgh Mathematical Society
  • ISSN: 0013-0915
  • EISSN: 1464-3839
  • URL: /core/journals/proceedings-of-the-edinburgh-mathematical-society
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