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arXiv · 1905.12174

A rational trigonometric relationship between the dihedral angles of a tetrahedron and its circumradius

Gennady Arshad Notowidigdo
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Abstract

This paper will extend a known relationship between the circumradius and dihedral angles of a tetrahedron in three-dimensional Euclidean space to three-dimensional affine space over a general field not of characteristic two, using only the framework of rational trigonometry devised by Wildberger. In this framework, a linear algebraic view of trigonometry is presented, which allows the associated three-dimensional vector space of such a three-dimensional affine space to be equipped with a non-degenerate symmetric bilinear form; this will also generalise the results presented to arbitrary geometries parameterised by such a non-degenerate symmetric bilinear form.

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Gennady Arshad Notowidigdo. 2019-05-29. A rational trigonometric relationship between the dihedral angles of a tetrahedron and its circumradius. https://arxiv.org/abs/1905.12174

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