Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

An angle in standard position has its initial side on the positive x-axis. Angle measurement is done counterclockwise from the initial side. To draw a $30^o$ angle in standard position, from the initial side on the positive x-axis, move 30 degrees counter clockwise. (refer to the attached image in the answer part)