Geometry

Question Analysis  

The task is to determine the unit circle coordinates for  (180°) using Quadrant I ratios.  

Key Concept Explanation  

Unit Circle at : The angle  terminates at (-1, 0) on the unit circle.  

Trig Values: , .  

Step-by-Step Solution  

1. Locate  on the unit circle:  

 corresponds to the point (-1, 0), as it lies directly on the negative x-axis.  

2. Coordinates:  

By definition,

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