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Theorems on the Tetrahedron
Published online by Cambridge University Press: 03 November 2016
Extract
If a tetrahedron with its opposite edges perpendicular is inscribed in a conicoid, its orthocentre (the intersection of the perpendiculars from the vertices to the opposite faces) will lie on the conicoid if the asymptotic cone of the conicoid has three perpendicular generators.
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- Copyright © Mathematical Association 1937