What are terminal and initial sides of an angle?

The video tutorial explains the concept of angle measurement, focusing on the initial and terminal sides. It discusses how angles are measured between two rays and the importance of standard form in determining the starting and ending points of measurement. The tutorial also covers the direction of angles, explaining how positive angles open counterclockwise and negative angles open clockwise. The initial side is always on the X-axis in standard form, while the terminal side varies based on the angle's direction. The video concludes by inviting viewers to leave comments or questions.

Describe how to determine the measurement of an angle between two rays.

What role does the X-axis play in defining the initial side of an angle?