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In geometry, the Murakami–Yano formula, introduced by Murakami & Yano (2005), is a formula for the volume of a hyperbolic or spherical tetrahedron given in terms of its dihedral angles.
References

Murakami, Jun; Yano, Masakazu (2005), "On the volume of a hyperbolic and spherical tetrahedron", Communications in Analysis and Geometry, 13 (2): 379–400, ISSN 1019-8385, MR 2154824, archived from the original (PDF) on 2012-04-10, retrieved 2012-02-10 url=http://www.f.waseda.jp/murakami/papers/tetrahedronrev4.pdf


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