trigonometry
/ˌtɹɪɡəˈnɒmətɹi/ noun C2- The branch of mathematics that deals with the relationships between the sides and angles of (in particular) right-angled triangles, as represented by the trigonometric functions, and with calculations based on said relationships. · Historically, trigonometry has been applied in areas such as geodesy, surveying, celestial mechanics and navigation.
Plural trigonometries
From the library
“‘When my old tutor used to give me an exercise in trigonometry, it always took the shape of measuring heights.
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