单词 | in-sphere |
释义 | in-spheren. Mathematics. A sphere that touches all the faces of a given polyhedron. ΘΚΠ the world > relative properties > number > geometry > shape or figure > [noun] > three-dimensional > sphere spherea1398 in-sphere1886 1886 G. S. Carr Synopsis Elem. Results Math. II. Index 890 In-sphere of a tetrahedron. 1939 H. S. M. Coxeter Ball's Math. Recreations & Ess. (ed. 11) v. 132 With each of these polyhedra we may associate three concentric spheres: one (the ‘circum-sphere’) through all the vertices, one touching all the edges, and one (the ‘in-sphere’) touching all the faces. This entry has not yet been fully updated (first published 1976; most recently modified version published online June 2018). < n.1886 |
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