Initial Side
The “initial side” refers to the starting position of an angle in the coordinate plane
The “initial side” refers to the starting position of an angle in the coordinate plane. In trigonometry, angles can be measured in standard position, which means they start from the positive x-axis and rotate counterclockwise.
To determine the initial side of an angle, imagine a coordinate plane. The positive x-axis lies to the right, and the positive y-axis extends upwards. Any angle in standard position starts from the positive x-axis and moves counterclockwise.
For example, if we have an angle of 45 degrees in standard position, its initial side would lie along the positive x-axis. Similarly, if we have an angle of 135 degrees, its initial side would still lie along the positive x-axis.
In summary, the initial side of an angle refers to the starting position of the angle as measured from the positive x-axis in standard position.
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