spherical geometry

noun
the branch of geometry that deals with figures on spherical surfaces.

Origin:
1720–30

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Collins
World English Dictionary
spherical geometry
 
n
the branch of geometry concerned with the properties of figures formed on the surface of a sphere

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
spherical geometry  
The geometry of circles, angles, and figures on the surface of a sphere.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Solutions in spherical geometry can also be obtained in one space dimension.
Neither spherical geometry nor the formation of a central hot spot is required in this approach.
The calculations were performed considering full water reflection and spherical geometry.
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