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