terminal side
The ray where measurement of an angle stops.
The terminal side of an angle in standard position is the side that starts at the origin and moves in a counterclockwise direction to form the angle. In other words, the terminal side is the ending point of the angle.
For example, if we consider an angle of 30 degrees in standard position, the initial side of the angle would be the positive x-axis, and the terminal side would be a line that starts at the origin, moves 30 degrees counterclockwise, and meets a point on the unit circle.
The direction of the terminal side is determined by the measure of the angle. A positive angle (measured counterclockwise) has a terminal side that moves in a counterclockwise direction from the initial side, and a negative angle (measured clockwise) has a terminal side that moves in a clockwise direction from the initial side.
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