Geometry

Question Analysis  

The question asks which angle corresponds to the unit circle coordinates (0, 1), focusing on identifying axis-aligned angles.  

 

Key Concept Explanation  

Unit Circle Axes: The point (0, 1) lies on the positive y-axis, corresponding to 90°. This is a foundational angle defined by its position on the unit circle.  

 

Step-by-Step Solution  

1. Locate (0, 1) on the unit circle:  

The positive y-axis intersection is at 90°.  

2. Confirm trigonometric values:  

(x-coordinate), (y-coordinate), matching (0, 1).  

 

Option Analysis  

30°: Incorrect (

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