Class 11 Maths Trigonometric Functions Introduction


Trigono + Metry = Triangle + Measure

Triangle is any figure that has 3 angles. Angle is the measure of rotation of a line about a fixed point.

Trigonometry is used in many areas such as the science of seismology, designing electric circuits, describing the state of an atom, predicting the heights of tides in the ocean, analyzing a musical tone and in many other areas.

Parts of Angles:   Initial side, Terminal Side & Vertex

 Two types of Angles:  Positive & Negative

Measure of angle is amount of rotation performed to get the terminal side from the initial side.

Type of measure of angle:  Degree Measure & Radian Measure

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