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Spherical trigonometry

branch of spherical geometry that deals with the relationships between trigonometric functions of the sides and angles of the spherical polygons.

Pronunciation
/ˈsfɛrɪkəl ˌtrɪɡəˈnɑmətri/
/ˈsfɛrɪkəl ˌtrɪɡəˈnɒmɪtri/