Introduction
Category : JEE Main & Advanced
The word trigonometry is derived from two greek words "trigonon" and "metron". The word "trigonon" means a triangle and the word "metron" means a measure. Hence the word trigonometry means the study of properties of triangles. This involves the measurement of angles and lengths.
The motion of any revolving line in a plane from its initial position (initial side) to the final position (terminal side) is called angle. The end point O about which the line rotates is called the vertex of the angle.
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