# spherical trigonometry

- the branch of trigonometry that deals with spherical triangles.

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## Origin of spherical trigonometry^{}

First recorded in 1720–30

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Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

## spherical trigonometry

- 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
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