It started off as a study of the properties of angles and sides of a trigon or triangle but has since broadened into the study of angles and sides of all polygons.
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Students are taught trigonometry so they meet the needs in architecture, astronomy and in other fields because trigonometry is the branch of Maths and maths is being used everywhere.
The uses of Sin, Cos etc. in Maths is in relation to Trigonometry. Trigonometry is the study of the relationship between angles and lengths of triangles.
TRIGONOMETRY
Trigonometry and the Pythagoras theorem were used in the pyramids.
Geomerty And Alegrba II (With trigonometry)