![]() 'Spherical Law of Cosines.' (Feb 23, 2017) en./wiki/Sphericallawof cosines. The deficiency of a solid angle equals its supplementary angle 3, pp. Greitzer, "Geometry Revisited" New Mathematical Library 19 Mathematical Association of America (1967) ISBN 08838561. The deficiency of a solid angle determined by an -sided spherical polygon with angles, ,, is.
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