On pedal tetrahedra
Robinson, R. T.; Robinson R. T.; 115 Shobnall Road, Burton-on-Trent.
Журнал:
Edinburgh Mathematical Notes
Дата:
1939
Аннотация:
1. In a tetrahedron ABCD with its opposite edges perpendicular there are two tetrahedra which can be described as pedal tetrahedra. (1) the tetrahedron A<sub>0</sub> B<sub>0</sub> C<sub>0</sub> D<sub>0</sub> where these points are the feet of the perpendiculars from ABCD on to the faces BCD.
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