Geometry

Question Analysis  

The main focus is to determine the coordinates on the unit circle for the angle using and , noting its position on the negative y-axis.  

 

Key Concept Explanation  

On the unit circle, coordinates for an angle are . At , the terminal side lies on the negative y-axis, where and .  

 

Step-by-Step Solution  

1. Recall unit circle positions:  

corresponds to the point on the unit circle.  

2. Apply trigonometric values:  

(x-coordinate),  

(y-coordinate).  

3. Form coordinates:  

The point is .  

 

Common Mistakes  

Confusing with (e.g., using

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