An angle is in standard position if its vertex is located at the:

1. Standard position fixes where the angle is drawn. 2. The vertex goes to the reference point of the axes. 3. An angle is in standard position if its vertex is located at the origin. 4. Its initial side extends along the positive x axis. _Source: OpenStax 'Algebra and Trigonometry 2e', Ch 7 'The Unit Circle: Sine and Cosine Functions'_