Initial Side
The starting position of a ray
An initial side is a term that is used in the context of angles. It refers to the starting position of an angle, which is usually on the positive x-axis in standard position. In other words, when an angle is drawn in standard position, the initial side is the side that lies along the x-axis, and it always begins at the origin (0,0).
For example, if you are given an angle of 45 degrees in standard position, the initial side of the angle will be the positive x-axis, starting from the origin and extending to the right. Similarly, if you are given an angle of 120 degrees in standard position, the initial side of the angle will be the positive x-axis, starting from the origin and extending to the right.
Understanding the initial side of an angle is important when calculating trigonometric functions, such as sine, cosine, and tangent. In these calculations, the initial side is used as a reference point for determining the position of the terminal side of the angle, which is the side that moves around the origin to create the angle.
More Answers:
Mastering Trigonometry: Simplifying Calculations Using Coterminal AnglesStandard Position: An Essential Concept In Plane Angle Measurement
The Terminal Side Of An Angle For Precise Trigonometric Calculations