Many aspects of our lives use Mathematics and Trigonometry. Be it engineering, information communication or surveying, trigonometry has certainly helped us in our jobs and in solving daily problems.
The basic building block of trigonometry is angle. It is defined as a figure formed by two rays sharing a vertex, thus it is also the measurement of the amount of rotation between two line segments.
The two rays drawn from the vertex are named the terminal side and the initial side. Angles are measured in either degrees (°) or radians. 1 radian is about 57.3°. Radians are much more useful and convenient in science and engineering, as well as in calculus.
Interactive Mathematics defines the standard position of an angle as:
"An angle is in standard position if the initial side is the positive x-axis and the vertex is at the origin. The 2 examples given above are in standard position.
We will use r, the length of the hypotenuse, and the lengths x and y when defining the trigonometric ratios..."
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