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单词 in-sphere
释义

in-spheren.

/ˈɪnsfɪə/
Etymology: < in- prefix1 1a(c) + sphere n.
Mathematics.
A sphere that touches all the faces of a given polyhedron.
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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).
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n.1886
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