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spherical trigonometry

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noun
  1. the branch of trigonometry that deals with spherical triangles.
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Origin of spherical trigonometry

First recorded in 1720–30
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for spherical trigonometry

spherical trigonometry

noun
  1. the branch of trigonometry concerned with the measurement of the angles and sides of spherical triangles
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012